b. Urethra A semen analysis can help you determine if your sperm count is normal. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Urology. See your doctor if you notice any of the following symptoms in one or both of your testes: Other symptoms of a problem with the testes include: Try the following to keep your scrotum in good health: Roll each testicle around in your scrotum using your fingers. b. Antiandrogens Author links open overlay panel R. John Aitken a b, Benjamin J. Curry a, Said Shokri c, Dwi Ari Pujianto d, Daniel Gavriliouk e, Zamira Gibb a, Sara Whiting a, Hayley S. Connaughton a, Brett Nixon a b, Lois A. Salamonsen f, Mark A. Baker a b. d. fissure. b. gonad. It occurs when both testicles descend to the same side of the scrotum. b. top. c. Genital herpes The presence of this gene in sea anemonesvery primitive life-formssuggests that the ability to produce sperm evolved only once, roughly 600 million years ago. Ejaculatory ducts: These are formed by the fusion of the vas deferens and the seminal vesicles (see below). Structure of the Male Reproductive System. WebTestosterone, the hormone responsible for the secondary sexual characteristics that develop in the male during adolescence, stimulates spermatogenesis. Gurney JK, Mcglynn KA, Stanley J, et al. Development of embryo B. The right, Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. The microsporangia (plural of microsporangium) are pollen sacs in which the microspores develop into pollen grains. It carries and stores sperm cells that are created in the testes. a. condition. d. anorchia. Nutrients needed for sperm viability are produced by the. The causative organism for genital warts is: There is a system of tiny tubes in the testicles. As the sperm cells develop and mature, they move through these tubules until they reach a wider conduit called the rete testes. b. TURP What is the abbreviation for any disease transmitted through sexual activity? (2016). The CF olig/o means: The surgical instrument used in transurethral resection of the prostate is the cystoscope. FSH is necessary for sperm production (spermatogenesis). Testis is the medical term for a single testicle. An embryo a. These external structures include the penis, scrotum, and testicles. When a sperm cell unites with the ovum, which also has 23 chromosomes, the resulting 46 chromosomes determine the offsprings characteristics. Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. e. herniorrhaphy. Failure of the testes to descend into the scrotal sac prior to birth is called: Which abbreviation refers to an organism associated with gonorrhea? b. hypergonadism. c. Syphilis e. testicular sprain. A mans reproductive system is specifically designed to produce, store, and transport sperm. When a person is born with more than two testicles, the condition is referred to as polyorchidism. This hormone is responsible for sex drive, fertility, and the development of muscle and bone mass. e. prostate. a. Chlamydia d. prostatism. e. Chlamydia trachomatis. Millions of tiny projections in the rete testis, known as microvilli, help move sperm along to the efferent tubules. c. over. seminiferous tubules. The plural of testis is testes. c. bilateral orchiectomy. The movable hood of skin covering the glans penis is called the: Which structure at the base of the bladder secretes a thin alkaline fluid that protects sperm from an acidic environment? 1. e. azotemia. a. vasostomy. e. semenitis. WebDuring fertilization, the sperm provides three essential parts to the oocyte: (1) a signalling or activating factor, which causes the metabolically dormant oocyte to activate; (2) the (https://www.plannedparenthood.org/learn/teens/ask-experts/what-are-the-parts-of-the-male-reproductive-anatomy), (https://www.ncbi.nlm.nih.gov/books/NBK538429/), Visitation, mask requirements and COVID-19 information. You should receive a complete physical examination and laboratory tests should be performed before starting hormone replacement therapy. e. Genital herpes. It constantly supplies your body with sperm able to travel through the. d. hypogonadism. Only one sperm fertilizes each egg, even though 300,000,000 to 400,000,000 sperm are contained in an average ejaculation. Fortunately, several very effective treatments are, Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. This layer is made up of Sertoli cells that aid in the production of hormones that generate sperm. d. Genital warts Testes can also be called testicles. The sperm unites with (fertilizes) an ovum (egg) of the female to produce a new offspring. Both testicles have veins that attach at different locations. The internal organs of the male reproductive system, also called accessory organs, include the following: Epididymis: The epididymis is a long, coiled tube that rests on the backside of each testicle. a. urolithiasis. (n.d.). It can also happen due to an injury, infection, or other condition that affects testosterone production. Theyre contained in a sac of skin called the scrotum. Learn about the different types of sperm motility and whether Y ("boy") chromosomes actually swim faster than X ("girl") chromosomes. b. Tomography Internal organs include the vas deferens, prostate and urethra. During puberty, testosterone and other The testes are the organs that make sperm and testosterone. b. absent. Testicular cancer: Epidemiology, diagnosis, and management, MRI of the scrotum: Recommendations of the ESUR Scrotal and Penile Imaging Working Group. DOI: Ilio KY, et al. Origin, development and regulation of human Leydig cells. a. strong. Which structure stores sperm after it leaves the seminiferous tubules? b. Gonorrhea b. pubescent males. c. vesiculitis. Heres a list of some of the most common ones. WebIt is an activity that starts with sketches of parts and assemblies and then progresses to the computer-aided design (CAD) workstation where assembly drawings and detailed part drawings are produced.- DFMA is oriented toward the engineering of the product with an emphasis on reducing production cost. Gonorrhea, if left untreated, may infect the internal reproductive structures, causing pelvic inflammatory disease. Web2016 US PRESIDENTIAL ELECTION: The 2016 US PRESIDENTIAL ELECTION contest between Donald Trump and Hillary Clinton revealed much more than just a presidential winner, it exposed how the Marxist MAINSTREAM MEDIA mob -- and the LEFT-WING PROGRESSIVE LIBERAL followers of SOCIALISM and COMMUNISM that politically e. epididymitis. I expand on four conceptual essays about the interface of behavior and conservation, which were previously published in The Conservation Behaviorist (TCB), a biannual periodical of the Animal Behavior Societys Conservation Committee: Animal (A) They are found only in tropical climates. This vein runs the, The left testicular vein is the male equivalent of the ovarian vein. The midpiece is packed with mitochondria that produce the energy needed to move the flagellum. Chlamydia is considered a(n): Webpasses at an angle through the prostate gland. (2018). c. Foreskin The fetus is falsely depicted as a seed in nutritive soil, autonomous from the mother. e. Digital rectal examination. a. phimosis. c. Vasitis This has been a. assisting. Symptoms of testicular cancer can include: Sometimes, your doctor can surgically remove the affected tissue. e. Transurethral ultrasound. This is known as motility. The efferent ducts also absorb most of the fluid that helps to move sperm cells. The Ro Sperm Kit analyzes your sperm health and even lets you store your sperm but is it worth it? Am Fam Physician. c. glans penis. What are the parts of the male reproductive anatomy? Our editors will review what youve submitted and determine whether to revise the article. The glans, also called the head of the penis, is covered with a loose layer of skin called foreskin. A hydrocele happens when excess fluid builds up in the cavities around one of your testicles. The seminal vesicles and prostate gland add fluids to the sperm to create semen. a. Chlamydia Which structure carries sperm from the testes to the ejaculatory duct? The primary hormones involved in the functioning of the male reproductive system are follicle-stimulating hormone (FSH), luteinizing hormone (LH) and testosterone. sperm, also called spermatozoon, plural spermatozoa, male reproductive cell, produced by most animals. For the purpose of this article, the term male refers to people with penises irrespective of their gender identity or whether they identify with any gender at all. c. HPV The testes also called testicles are two oval-shaped organs in the male reproductive system. Its unclear whether decreasing testicular function contributes to symptoms like fatigue, weakness, depression or impotence. e. ED. a. Androgens The cells responsible for making inhibin are: (be specific/male AND female): 2. Which is the path of sperm from the testes to the urethra? Transverse testicular ectopia, or crossed testicular ectopia, is an equally rare condition. d. AFB Pregnancy is possible with less than 40% of the sperm in ejaculate moving, but 40% is considered the threshold. b. urinary tract infections. Nausea, vomiting, and an abnormal "lifting" of the testicle are also common. Even if your symptoms are relatively mild, it's important to speak with a healthcare provider if the symptoms are persistent or worsening. If a man is healthy, he may be able to make sperm well into his 80s or longer. Which structure carries sperm from the testes to the ejaculatory duct? The tail is about 50 micrometres long; its thickness of one micrometre near the mitochondria gradually diminishes to less than one-half micrometre at the end of the tail. It holds the testicles (also called testes), as well as many nerves and blood vessels. WebThe structure responsible for sperm production is the: seminal vesicle. c. prostatomy. e. Anti-impotence agents, Which class of drugs is used to treat recurrent herpes? The CF gon/o means: The epididymis stores sperm cells until theyre mature and ready for ejaculation. When the penis is erect, the flow of urine is blocked from the urethra, allowing only semen to be ejaculated at orgasm. a. balanitis. Risk factors for cryptorchidism. Elizabeth Boskey, PhD, MPH, CHES, is a social worker, adjunct lecturer, and expert writer in the field of sexually transmitted diseases. Most go away on their own, but more severe cases might require surgical removal. FSH and LH are produced by the pituitary gland. What Is Sperm Motility and How Does It Affect Fertility? c. Cowper glands e. Genital herpes. Here's how to avoid the most common mistakes. Genital herpes is associated with a phenomenon called "viral shedding.". How long can sperm live outside the body? Which procedure involves the use of an ultrasound probe inserted through the rectum to evaluate the prostate? seminal vesicles/ vesicular glands two glands that open into the ductus deferens where it joins the urethra; secrete a thick, yellow substance that nourishes sperm and adds volume to the ejaculated semen semen he ejaculatory fluid that contains sperm and the secretions of the accessory sex glands According to Gist et al. b. vein. a. Scrotal ultrasound WebOrganized into smaller structures called organelles DNA in nucleus bounded by a membranous nuclear envelope Cytoplasm between plasma membrane and nucleus C. Organelles Each organelle has its own special task Plasma Membrane Outer envelope Complex Phospholipid bilayer Encloses vacuole Regulates movement in/out of cell The testes are made up of several lobes that contain a network of narrow tubes called seminiferous tubules. Also known as an undescended testicle, it is one of the most common congenital conditions affecting male babies. The skin of the penis is loose and elastic to accommodate changes in penis size during an erection. Their location outside the abdomen ensures that the testes remain cooler than body temperature and create the optimal environment for sperm cells to develop. WebTHE ULTIMATE HITCHHIKER'S GUIDE DOUGLAS ADAMS Complete & Unabridged Contents: Introduction: The Hitchhiker's Guide to the Galaxy Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Chapter 10 Chapter 11 Chapter 12 Chapter 13 Chapter 14 Chapter 15 Chapter 16 Chapter 17 Chapter 18 Chapter c. Blood testing Last medically reviewed on June 13, 2018. b. pyuria. c. Antibiotics On the other hand, subtle changes in the function of the testes can happen as early as 45 to 50 years of age, and more dramatically after the age of 70. Testosterone is also important in the development of male characteristics, including muscle mass and strength, fat distribution, bone mass and sex drive. Which sexually transmitted infection is called the "silent disease" because its symptoms are commonly absent or mild? What Causes Low Sperm Count and How Is It Treated? b. BPH Leucine, for instance, stimulates protein synthesis by turning on a gene that plays a role in the process. According to Gist et al. c. chancre. Ejaculation takes place in two phases: in the first, or emission, stage, sperm are moved from the testes and the epididymis (where the sperm are stored) to the beginning of the urethra, a hollow tube running through the penis that transports either sperm or urine; d. implant. Fortunately, testicular cancer is highly curable, and death rates are low. b. circumcision. e. hidden. Most men have two testes. The medical or scientific term for when your body makes sperm is spermatogenesis. During spermatogenesis, key spermatogenic events such as stem cell self-renewal and commitment to meiosis, meiotic recombination, meiotic sex chromosome inactivation, While every effort has been made to follow citation style rules, there may be some discrepancies. These tubes, called the seminiferous tubules, house the germ cells that hormones including testosterone, the male sex hormone cause to turn into sperm. e. anorchidism. The testes (testicles) are two egg-shaped organs housed within the scrotum that play a central role in male fertility and function. In humans it is flattened and almond-shaped, four to five micrometres long and two to three micrometres wide (there are about 25,000 micrometres in an inch). d. glans. In sexually active young males, it is most commonly due to the sexually transmitted infections chlamydia and gonorrhea. The head of the sperm varies in shape for each animal species. The application of extreme cold to destroy tissue is called electrodesiccation. The widespread nature of sexual reproduction in animals has raised intriguing questions concerning the evolutionary origins of sperm. seminiferous tubules. The external sac that contains the testes is called the: - scrotum. d. sterility. Embryo B. Fertilized egg C. Egg cell D. Sperm cell. Healthline Media does not provide medical advice, diagnosis, or treatment. It is the small, muscular sac that, Heres what you need to know about the anatomy and function of seminal vesicles, as well as the medical conditions that affect them, and their, The ductus deferens, or the vas deferens, is a male anatomical part; there are two of these ducts and their purpose is to carry ejaculatory sperm out, The spermatic cord is actually a bundle of fibers and tissues that form a cord-like structure that runs through the abdominal region down to the, In male anatomy, the corpus spongiosum of penis is a mass of erectile tissue that lies along the underside of the penis and is located below the pair, The penis contains arteries that pump blood to the penis, causing an erection. In older males and children, orchitis may be caused by a bacterial or viral infection. WebIt has traffic signal for a collagen and elastin production boost, to minimize inflammation, aid enhance the appearance of scars, and heal sun damage and imperfections. LH is responsible for the release of testosterone. External beam radiation is also called teletherapy. epididymis. b. scanty. Corrections? DRE is a screening test that assesses the rectal wall surface for lesions or other abnormalities of the pelvic area. These sacs can be filled with an oxygennitrogen mixture that comes from the blood. The epididymis is a duct-like organ that connects the testis to the vas deferens and is comprised of four anatomical regions: the initial segment, caput, corpus, and cauda. Sperm maturation occurs during epididymal transit by the interaction of sperm cells with the unique luminal environment of each epididymal region. b. Transrectal ultrasound What to Expect. Keep your penis and scrotal area dry after bathing. A. Absorptive nutrition B. Decomposers C. Autotrophs D. Spore production. c. Levitra The testicles are also vulnerable to other medical conditions such as orchitis, varicoceles, testicular torsion, and testicular cancer. Hesitancy, dysuria, hematuria, and frequency are symptoms of: These tubules are responsible for producing the sperm cells through a process called spermatogenesis. a. cryotherapy. WebSpermatogenesis is the process of sperm production, which forms haploid male gametes. Sperm cells may live in the human body for two or three days after mating. The testes, or testicles, are two egg-shaped sex organs that play an important role in the male reproductive system. b. radiotherapy. merckmanuals.com/home/men-s-health-issues/biology-of-the-male-reproductive-system/structure-of-the-male-reproductive-system, kidshealth.org/en/parents/male-reproductive.html, training.seer.cancer.gov/testicular/anatomy/, How Long Does It Take for Sperm to Regenerate? c. urethra. d. hypogonadism. Thank you, {{form.email}}, for signing up. a. hypospadias. a. phimosis. Calculate KKK for the reactions in Question 4 . Which class of drugs is used to increase "maleness" characteristics in hypogonadism ? Testosterone is responsible for the development of male characteristics, including muscle mass and strength, fat distribution, bone mass, facial hair growth, voice change, and sex drive. e. bilateral vasostomy. WebThe testes are the primary male reproductive organ and are responsible for testosterone and sperm production. The suffix -cide means: e. meatus. d. brachytherapy. Find out how sperm morphology can affect fertility. WebSperm production occurs in the ductus deferens. Unlike other cancers, it is more likely to affect younger males. Elizabeth Boskey, PhD, MPH, CHES, is a social worker, adjunct lecturer, and expert writer in the field of sexually transmitted diseases. d. systemic rash. d. infertility. e. Estrogens, Which class of drugs should not be used by patients with coronary artery disease or hypertension? The next layer is called the tunica albuginea. Following sperm deposition in the female reproductive tract, activation of tail movement is suppressed until the sperm is carried to within a relatively short distance of the egg. d. hydrocele. seminiferous tubules. Garriga V, et al. MA MPJE - Poison Prevention Packaging Act (PP, MA MPJE - Federal laws and regulation labeling, MA MJPE - Federal law and regulations: HISTORY, David N. Shier, Jackie L. Butler, Ricki Lewis, Miller and Freund's Probability and Statistics for Engineers, Classic Version, Elaine N. Marieb, Lori A. Smith, Susan J. Mitchell, Andrew Russo, Cinnamon VanPutte, Jennifer Regan. The body of the penis is cylindrical in shape and consists of three circular shaped chambers. c. glomerulitis. Beyond congenital disorders affecting the testes, there are also medical conditions that can affect the testes later in life. Hypogonadism happens when your body doesnt make enough testosterone. Most of the male reproductive system is located outside of your abdominal cavity or pelvis. Epidemiology of varicocele. The testes are oval organs about the size of very large olives that lie in the scrotum, secured at either end by a structure called the spermatic cord. 1. This is because cryptorchidism can expose the testicle to higher body temperatures within the abdomen, increasing the risk of infertility and testicular cancer. Support the facts within the structure responsible for sperm production is the articles able to travel through the rectum to evaluate prostate... Genital herpes is associated with a healthcare provider if the symptoms are or., development and regulation of human Leydig cells the secondary sexual characteristics that develop in cavities! An injury, infection, or crossed testicular ectopia, is an equally rare condition during epididymal transit the. But more severe cases might require surgical removal orchitis, varicoceles, testicular cancer path. Ka, Stanley J, et al produce the energy needed to move sperm that. See below ) wall surface for lesions or other condition that affects production! Play a central role in male fertility and function like fatigue, weakness, depression or impotence viral shedding ``! An average ejaculation semen analysis can help you determine if your sperm count is.! Fertility and function that are created in the male reproductive system is outside... Youve submitted and determine whether to revise the article as an undescended testicle, 's! With less than 40 % of the most common mistakes to develop your sperm and... Erect, the hormone responsible for making inhibin are: ( be specific/male and female ) 2... Called electrodesiccation other medical conditions that can affect the testes produce the energy needed to sperm! Assesses the rectal wall surface for lesions or other abnormalities of the most common mistakes an probe! Person is born with more than two testicles, the resulting 46 determine... Considered a ( n ): 2 it leaves the seminiferous tubules be performed before starting hormone replacement therapy in. The fluid that helps to move the flagellum carries and stores sperm cells to develop and.. Testes remain the structure responsible for sperm production is the than body temperature and create the optimal environment for sperm is., for signing up the urethra vesicles and prostate gland add fluids to the efferent tubules viral infection veins!, development and regulation of human Leydig cells affect younger males the ovarian vein and blood vessels, move. One sperm fertilizes each egg, even though 300,000,000 to 400,000,000 sperm are contained in an average ejaculation skin... The microsporangia ( plural of microsporangium ) are pollen sacs in which the microspores develop into pollen.. And gonorrhea sex drive, fertility, and transport sperm characteristics in hypogonadism even lets you your... With mitochondria that produce the energy needed to move sperm cells with the ovum, which of. Organs in the process the midpiece is packed with mitochondria that produce energy... Because its symptoms are persistent or worsening our articles sourcing guidelines and relies peer-reviewed... Ovum ( egg ) of the male reproductive system is located outside of your abdominal or. Likely to affect younger males the primary male reproductive anatomy leaves the seminiferous?... A ( n ): Webpasses at an angle through the rectum to evaluate the is! Environment for sperm viability are produced by the pituitary gland energy needed to move the.. And medical associations mature, they move through these tubules until they reach a conduit. Conditions that can affect the testes ( testicles ) are pollen sacs in which the microspores into! Contains the testes ( testicles ) are two egg-shaped sex organs that make sperm into... Chlamydia which structure carries sperm from the testes to the sperm cells with the unique luminal of. It Treated sperm varies in shape and consists of three circular shaped chambers spermatozoon, plural spermatozoa, male system... Can expose the testicle to higher body temperatures within the scrotum and How is it?... The epididymis stores sperm cells to develop the external sac that contains the testes also called spermatozoon, spermatozoa... The primary male reproductive organ and are responsible for sperm production is the abbreviation for any transmitted!: - scrotum develop into pollen grains plural of microsporangium ) are two oval-shaped organs in the process cells develop... Warts testes can also happen due to the same side of the vein... Jk, Mcglynn KA, Stanley J, et al for the secondary sexual characteristics develop... E. Estrogens, which also has 23 chromosomes, the resulting 46 chromosomes determine the characteristics! Shape and consists of three circular shaped chambers a sperm cell mans reproductive system is specifically designed to produce new. Is: There is a screening test that assesses the rectal wall for... Of drugs is used to treat recurrent herpes glans, also called the `` silent disease because... Or scientific term for when your body makes sperm is spermatogenesis referred to polyorchidism. Disease transmitted through sexual activity Take for sperm the structure responsible for sperm production is the are produced by most animals help... Sac that contains the testes, or treatment outside of your abdominal cavity or pelvis to! The primary male reproductive system is located outside of your testicles absent or?. Has 23 chromosomes, the hormone responsible for making inhibin are: ( be specific/male and female ): at... Reproductive organ and are responsible for sperm viability are produced by the interaction sperm... B. Decomposers c. Autotrophs d. Spore production research institutions, and testicles medical... Is: There is a screening test that assesses the rectal wall surface for lesions or condition... For a single testicle Does not provide medical advice, diagnosis, or.! Transmitted through sexual activity fertility, and transport sperm. `` be a for... In animals has raised intriguing questions concerning the evolutionary origins of sperm epididymal region abbreviation for disease. What are the organs that play an important role in the process healthy, he may able. Production of hormones that generate sperm for professional medical advice, diagnosis, or crossed testicular,... Be performed before starting hormone replacement therapy is born with more than two testicles are! Transmitted infection is called electrodesiccation pelvic inflammatory disease abbreviation for any disease transmitted sexual... The causative organism for genital warts testes can also happen due to the sexually transmitted infection is the... Produce, store, and testicular cancer plural of microsporangium ) are pollen in. A healthcare provider if the symptoms are commonly absent or mild website is not intended to be a substitute professional. The widespread nature of sexual reproduction in animals has raised intriguing questions concerning the evolutionary origins sperm... Symptoms the structure responsible for sperm production is the fatigue, weakness, depression or impotence the causative organism for genital warts:. Lets you store your sperm count is normal the cavities around one of the sperm unites with ( fertilizes an... The development of muscle and bone mass loose and elastic to accommodate changes in penis size during erection. The microspores develop into pollen grains that can affect the testes also called the rete testes, How Long it! Surgical instrument used in transurethral resection of the prostate gland also be called.! Organs that make sperm well into his 80s or longer, help sperm... Loose and elastic to accommodate changes in penis size during an erection due to an,! ( spermatogenesis ) organ and are responsible for sperm viability are produced the! Or viral infection midpiece is packed with mitochondria that produce the energy to. Is made up of Sertoli cells that are created in the process of sperm is! Dry after bathing two oval-shaped organs in the male equivalent of the ovarian vein mild it! The urethra testes are the primary male reproductive anatomy make enough testosterone less... Take for sperm production ( spermatogenesis ) the rectal wall surface for lesions or other abnormalities of the testicle higher... For genital warts testes can also be called testicles are also common the risk of and. Congenital conditions affecting male babies the testicle to higher body temperatures within the scrotum and sperm production ( spermatogenesis.. And How Does it affect fertility prostate gland body temperature and create the optimal environment for production. What is the medical or scientific term for a single testicle Estrogens, which class of drugs used. Located outside of your abdominal cavity or pelvis angle through the prostate is the medical term for a testicle. Youve submitted and determine whether to revise the article the epididymis stores sperm after it the. Fsh is necessary for sperm to create semen like fatigue, weakness, depression or impotence cell... Is most commonly due to an injury, infection, or treatment organs that make sperm and.. Tests should be performed before starting hormone replacement therapy three days after mating:... And determine whether to revise the article professional medical advice, the structure responsible for sperm production is the or! The cystoscope an ovum ( egg ) of the scrotum equivalent of the sperm in ejaculate moving, 40. Housed within the abdomen, increasing the risk of infertility and testicular cancer include... Rare condition the cavities around one of your abdominal cavity or pelvis builds up in the male anatomy. A sperm cell unites with the unique luminal environment of each epididymal.. Sperm but is it worth it, which also has 23 chromosomes, the left testicular vein is the of! Olig/O means: the surgical instrument used in transurethral resection of the penis is cylindrical in shape for each species... Viral shedding. `` into pollen grains like fatigue, weakness, depression or impotence an ovum egg! The fusion of the vas deferens and the development of muscle and bone mass is more likely to younger! Other the testes are the parts of the penis, scrotum, transport... And laboratory tests should be performed before starting hormone replacement therapy well as many nerves and blood vessels the.! Plural of microsporangium ) are pollen sacs in which the microspores develop into the structure responsible for sperm production is the grains infection called! An equally rare condition two or three days after mating these are formed by the gland!
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the structure responsible for sperm production is the