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Questions and Answers
The testis is responsible for producing sperm and secreting hormones.
True
The scrotum is a sac of skin and superficial fascia that hangs outside the abdominopelvic cavity.
True
The seminiferous tubules are responsible for producing testosterone.
False
Spermatogenesis occurs in the seminiferous tubules.
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The sperm head contains mitochondria.
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Sertoli cells are involved in the formation of sperm.
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The rete testis is a network of tubules that store sperm.
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The efferent ductules are lined with simple cuboidal epithelium.
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The testis is located inside the abdominopelvic cavity.
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The testis weighs around 1-2 grams.
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The epididymis is responsible for monitoring and adjusting fluid produced by seminiferous tubules.
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The ductus deferens is 20 cm long.
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The epididymis is divided into head, body, and tail regions.
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The seminal vesicles produce about 40% of semen volume.
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The prostate gland encircles the distal portion of the urethra.
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The ductus deferens is surrounded by a thick layer of smooth muscle.
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The epididymis stores and protects spermatozoa.
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The seminal vesicles are small, muscular organs.
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The prostate gland produces alkaline mucus prior to ejaculation.
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The ejaculatory duct is a short passageway that empties into the urinary bladder.
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The testis is egg-shaped and weighs around 10-15 grams.
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Sertoli cells are involved in the production of testosterone.
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The rete testis is a network of tubules that store sperm.
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The epididymis is responsible for monitoring and adjusting the fluid produced by the seminiferous tubules.
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The seminiferous tubules are lined with simple cuboidal epithelium.
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Testosterone is important for spermatogenesis and sexual differentiation during embryonic development.
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The scrotum is located inside the abdominopelvic cavity.
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The efferent ductules are lined with simple squamous epithelium.
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The testis produces sperm but not hormones.
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The seminiferous tubules are responsible for producing sperm.
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The epididymis is the primary storage location of spermatozoa.
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The ductus deferens begins at the head of the epididymis.
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The epithelium of the epididymis includes ciliated and non-ciliated cells.
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The prostate gland is located above the urinary bladder.
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The seminal vesicles produce about 20% of semen volume.
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The ejaculatory duct penetrates the wall of the prostate gland and empties into the urinary bladder.
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The ductus deferens has a lumen that decreases in diameter.
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The epididymis is a muscular organ.
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The seminal vesicles are tubular glands coiled and folded into a 10 cm by 5 cm mass.
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The prostate gland consists of 10-20 compound tubuloalveolar glands.
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Study Notes
The Male Reproductive System
- The main task of the reproductive system is the production of reproductive cells and the secretion of hormones.
The Testis
- The testis is egg-shaped, 5 cm long, 3 cm wide, and 2.5 cm thick, and weighs 10-15 grams.
- It hangs in the scrotum and produces sperm, as well as contains endocrine cells that secrete hormones like testosterone.
- Testosterone is important for spermatogenesis, sexual differentiation, and control of gonadotropin secretion.
Seminiferous Tubules
- Seminiferous tubules are where sperm production takes place.
- They have a basement membrane with lamina propria, Sertoli cells, spermatogonia, primary spermatocytes, secondary spermatocytes, and spermatids.
- Leydig cells are interstitial cells that produce testosterone.
Sperm
- Sperm have three major regions: head, midpiece, and tail.
- The head contains DNA and has a helmet-like acrosome containing hydrolytic enzymes that allow the sperm to penetrate and enter the egg.
- The midpiece contains mitochondria spiraled around the tail filaments.
- The tail is a typical flagellum produced by a centriole.
Epididymis
- The epididymis has three functions: monitors and adjusts fluid produced by seminiferous tubules, recycles damaged spermatozoa, and stores and protects spermatozoa.
- It has a head, body, and tail, with the head receiving spermatozoa from efferent ductules.
- The epididymis body has pseudostratified columnar epithelium with microvilli, and the tail has loose connective tissue and a layer of smooth muscle.
Ductus Deferens (Vas Deferens)
- The ductus deferens is 40-45 cm long and begins at the tail of the epididymis, ascending through the inguinal canal.
- It curves inferiorly along the urinary bladder toward the prostate gland and seminal glands.
- The lumen enlarges into an ampulla, and the wall contains a thick layer of smooth muscle.
Ejaculatory Duct
- The ejaculatory duct is a short passageway (2 cm) at the junction of the ampulla and seminal gland duct.
- It penetrates the wall of the prostate gland and empties into the urethra.
Accessory Genital Glands
Seminal Vesicle
- The seminal vesicle is about 15 cm long with short side branches from the body.
- It is a tubular gland coiled and folded into a 5 cm by 2.5 cm mass.
- It is an extremely active secretory gland, producing 60% of semen volume, including fructose, fibrinogen, and prostaglandins.
Prostate Gland
- The prostate gland is a small, muscular organ, about 4 cm in diameter, which encircles the proximal portion of the urethra.
- It consists of 30-50 compound tubuloalveolar glands surrounded by smooth muscle fibers.
The Male Reproductive System
- The main task of the reproductive system is the production of reproductive cells and the secretion of hormones.
The Testis
- The testis is egg-shaped, 5 cm long, 3 cm wide, and 2.5 cm thick, and weighs 10-15 grams.
- It hangs in the scrotum and produces sperm, as well as contains endocrine cells that secrete hormones like testosterone.
- Testosterone is important for spermatogenesis, sexual differentiation, and control of gonadotropin secretion.
Seminiferous Tubules
- Seminiferous tubules are where sperm production takes place.
- They have a basement membrane with lamina propria, Sertoli cells, spermatogonia, primary spermatocytes, secondary spermatocytes, and spermatids.
- Leydig cells are interstitial cells that produce testosterone.
Sperm
- Sperm have three major regions: head, midpiece, and tail.
- The head contains DNA and has a helmet-like acrosome containing hydrolytic enzymes that allow the sperm to penetrate and enter the egg.
- The midpiece contains mitochondria spiraled around the tail filaments.
- The tail is a typical flagellum produced by a centriole.
Epididymis
- The epididymis has three functions: monitors and adjusts fluid produced by seminiferous tubules, recycles damaged spermatozoa, and stores and protects spermatozoa.
- It has a head, body, and tail, with the head receiving spermatozoa from efferent ductules.
- The epididymis body has pseudostratified columnar epithelium with microvilli, and the tail has loose connective tissue and a layer of smooth muscle.
Ductus Deferens (Vas Deferens)
- The ductus deferens is 40-45 cm long and begins at the tail of the epididymis, ascending through the inguinal canal.
- It curves inferiorly along the urinary bladder toward the prostate gland and seminal glands.
- The lumen enlarges into an ampulla, and the wall contains a thick layer of smooth muscle.
Ejaculatory Duct
- The ejaculatory duct is a short passageway (2 cm) at the junction of the ampulla and seminal gland duct.
- It penetrates the wall of the prostate gland and empties into the urethra.
Accessory Genital Glands
Seminal Vesicle
- The seminal vesicle is about 15 cm long with short side branches from the body.
- It is a tubular gland coiled and folded into a 5 cm by 2.5 cm mass.
- It is an extremely active secretory gland, producing 60% of semen volume, including fructose, fibrinogen, and prostaglandins.
Prostate Gland
- The prostate gland is a small, muscular organ, about 4 cm in diameter, which encircles the proximal portion of the urethra.
- It consists of 30-50 compound tubuloalveolar glands surrounded by smooth muscle fibers.
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Description
Learn about the male reproductive system, its functions, and the role of the testis in producing sperm and hormones.
