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Questions and Answers
The testis is responsible for producing sperm and secreting hormones.
The testis is responsible for producing sperm and secreting hormones.
True (A)
The scrotum is a sac of skin and superficial fascia that hangs outside the abdominopelvic cavity.
The scrotum is a sac of skin and superficial fascia that hangs outside the abdominopelvic cavity.
True (A)
The seminiferous tubules are responsible for producing testosterone.
The seminiferous tubules are responsible for producing testosterone.
False (B)
Spermatogenesis occurs in the seminiferous tubules.
Spermatogenesis occurs in the seminiferous tubules.
The sperm head contains mitochondria.
The sperm head contains mitochondria.
Sertoli cells are involved in the formation of sperm.
Sertoli cells are involved in the formation of sperm.
The rete testis is a network of tubules that store sperm.
The rete testis is a network of tubules that store sperm.
The efferent ductules are lined with simple cuboidal epithelium.
The efferent ductules are lined with simple cuboidal epithelium.
The testis is located inside the abdominopelvic cavity.
The testis is located inside the abdominopelvic cavity.
The testis weighs around 1-2 grams.
The testis weighs around 1-2 grams.
The epididymis is responsible for monitoring and adjusting fluid produced by seminiferous tubules.
The epididymis is responsible for monitoring and adjusting fluid produced by seminiferous tubules.
The ductus deferens is 20 cm long.
The ductus deferens is 20 cm long.
The epididymis is divided into head, body, and tail regions.
The epididymis is divided into head, body, and tail regions.
The seminal vesicles produce about 40% of semen volume.
The seminal vesicles produce about 40% of semen volume.
The prostate gland encircles the distal portion of the urethra.
The prostate gland encircles the distal portion of the urethra.
The ductus deferens is surrounded by a thick layer of smooth muscle.
The ductus deferens is surrounded by a thick layer of smooth muscle.
The epididymis stores and protects spermatozoa.
The epididymis stores and protects spermatozoa.
The seminal vesicles are small, muscular organs.
The seminal vesicles are small, muscular organs.
The prostate gland produces alkaline mucus prior to ejaculation.
The prostate gland produces alkaline mucus prior to ejaculation.
The ejaculatory duct is a short passageway that empties into the urinary bladder.
The ejaculatory duct is a short passageway that empties into the urinary bladder.
The testis is egg-shaped and weighs around 10-15 grams.
The testis is egg-shaped and weighs around 10-15 grams.
Sertoli cells are involved in the production of testosterone.
Sertoli cells are involved in the production of testosterone.
The rete testis is a network of tubules that store sperm.
The rete testis is a network of tubules that store sperm.
The epididymis is responsible for monitoring and adjusting the fluid produced by the seminiferous tubules.
The epididymis is responsible for monitoring and adjusting the fluid produced by the seminiferous tubules.
The seminiferous tubules are lined with simple cuboidal epithelium.
The seminiferous tubules are lined with simple cuboidal epithelium.
Testosterone is important for spermatogenesis and sexual differentiation during embryonic development.
Testosterone is important for spermatogenesis and sexual differentiation during embryonic development.
The scrotum is located inside the abdominopelvic cavity.
The scrotum is located inside the abdominopelvic cavity.
The efferent ductules are lined with simple squamous epithelium.
The efferent ductules are lined with simple squamous epithelium.
The testis produces sperm but not hormones.
The testis produces sperm but not hormones.
The seminiferous tubules are responsible for producing sperm.
The seminiferous tubules are responsible for producing sperm.
The epididymis is the primary storage location of spermatozoa.
The epididymis is the primary storage location of spermatozoa.
The ductus deferens begins at the head of the epididymis.
The ductus deferens begins at the head of the epididymis.
The epithelium of the epididymis includes ciliated and non-ciliated cells.
The epithelium of the epididymis includes ciliated and non-ciliated cells.
The prostate gland is located above the urinary bladder.
The prostate gland is located above the urinary bladder.
The seminal vesicles produce about 20% of semen volume.
The seminal vesicles produce about 20% of semen volume.
The ejaculatory duct penetrates the wall of the prostate gland and empties into the urinary bladder.
The ejaculatory duct penetrates the wall of the prostate gland and empties into the urinary bladder.
The ductus deferens has a lumen that decreases in diameter.
The ductus deferens has a lumen that decreases in diameter.
The epididymis is a muscular organ.
The epididymis is a muscular organ.
The seminal vesicles are tubular glands coiled and folded into a 10 cm by 5 cm mass.
The seminal vesicles are tubular glands coiled and folded into a 10 cm by 5 cm mass.
The prostate gland consists of 10-20 compound tubuloalveolar glands.
The prostate gland consists of 10-20 compound tubuloalveolar glands.
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.
