1. Describe the function of the scrotum in protecting the testes from temperature fluctuations.
Scrotum is an external sex organ. The scrotum is a pouch like structure made up of skin. It has 2 main functions. It protects the testis and maintains 2-3oc temperature lower than body temperature, which is very important for spermatogenesis. The scrotum also contains numerous blood vessels and nerves. The cremaster muscle present in the scrotum contracts and pulls scrotum closer to the body whenever the outside temperature falls too low, this maintains the scrotum temperature.
2. Describe the internal structure of a testis. Where are sperm cells produced? What are the functions of sustentacular cells and interstitial (Leydig) cells?
Around the …show more content…
Which ducts transport sperm within the testes?
The ducts that transport sperm within the testes are the epididymis, vas deferens, ejaculatory duct and urethra.
7. Describe the location, structure, and functions of the ductus epididymis, ductus (vas) deferens, and ejaculatory duct.
The epididymis is a long tube that measures about 6 m (20 ft) in length. It is located along the superior and posterior margins of the testes. Epididymis is tightly coiled and has a comma-shaped. It consists of 3 regions; The head (superior portion), the body (midportion) and the tail (distal end). The epididymis consists of pseudostratified columnar epithelium, with is surrounded by layers of smooth muscle. It also has stereocilia, which is different from cilia.
Functions; The epididymis stores and transports sperms. It is also site for sperm maturation.
Ductus deferens (vas deferens) is a muscular duct that conveys sperm from the epididymis to the ejaculatory ducts. Ductus deferens is about 45 cm (18 in.) in length. The right and left vas deferens are connected to each side of the epididymis and it travels from epididymis through the spermatic cord into the pelvic cavity and behind the urinary bladder. The mucosa of vas deferens contains pseudostratified columnar epithelium and lamina propria. The muscularis is made up of 3 layers of smooth muscles which include the inner and outer longitudinal layers, and the middle layer …show more content…
Function; The ovaries produce gametes and female sex hormones (progesterone and estrogens), also inhibin and relaxin.
16. Describe the principal events of oogenesis.
Oogenesis is the production of an ovum (egg) and it occurs in the ovaries. Oogenesis starts with the primary oocytes formation via oocytogenesis and it occurs before birth. In this process, a female germ cell oogonium (diploid 2n) undergo a cell division (mitosis) to make more oogonium and primary oocyte.
During fetus development, the primary oocytes will purse in prophase I. After puberty begins, the primary oocytes (dipole 2n) undergoes meiosis I to create a secondary oocyte and a polar body, both a haploid cells (1n). The secondary oocyte is what is ovulated. It goes through the fallopian tube and can be possibly be fertilizer. If it is fertilized, the meiosis II will be completed and as a result forms ovum and a second polar body (both haploid cells
Scrotum is an external sex organ. The scrotum is a pouch like structure made up of skin. It has 2 main functions. It protects the testis and maintains 2-3oc temperature lower than body temperature, which is very important for spermatogenesis. The scrotum also contains numerous blood vessels and nerves. The cremaster muscle present in the scrotum contracts and pulls scrotum closer to the body whenever the outside temperature falls too low, this maintains the scrotum temperature.
2. Describe the internal structure of a testis. Where are sperm cells produced? What are the functions of sustentacular cells and interstitial (Leydig) cells?
Around the …show more content…
Which ducts transport sperm within the testes?
The ducts that transport sperm within the testes are the epididymis, vas deferens, ejaculatory duct and urethra.
7. Describe the location, structure, and functions of the ductus epididymis, ductus (vas) deferens, and ejaculatory duct.
The epididymis is a long tube that measures about 6 m (20 ft) in length. It is located along the superior and posterior margins of the testes. Epididymis is tightly coiled and has a comma-shaped. It consists of 3 regions; The head (superior portion), the body (midportion) and the tail (distal end). The epididymis consists of pseudostratified columnar epithelium, with is surrounded by layers of smooth muscle. It also has stereocilia, which is different from cilia.
Functions; The epididymis stores and transports sperms. It is also site for sperm maturation.
Ductus deferens (vas deferens) is a muscular duct that conveys sperm from the epididymis to the ejaculatory ducts. Ductus deferens is about 45 cm (18 in.) in length. The right and left vas deferens are connected to each side of the epididymis and it travels from epididymis through the spermatic cord into the pelvic cavity and behind the urinary bladder. The mucosa of vas deferens contains pseudostratified columnar epithelium and lamina propria. The muscularis is made up of 3 layers of smooth muscles which include the inner and outer longitudinal layers, and the middle layer …show more content…
Function; The ovaries produce gametes and female sex hormones (progesterone and estrogens), also inhibin and relaxin.
16. Describe the principal events of oogenesis.
Oogenesis is the production of an ovum (egg) and it occurs in the ovaries. Oogenesis starts with the primary oocytes formation via oocytogenesis and it occurs before birth. In this process, a female germ cell oogonium (diploid 2n) undergo a cell division (mitosis) to make more oogonium and primary oocyte.
During fetus development, the primary oocytes will purse in prophase I. After puberty begins, the primary oocytes (dipole 2n) undergoes meiosis I to create a secondary oocyte and a polar body, both a haploid cells (1n). The secondary oocyte is what is ovulated. It goes through the fallopian tube and can be possibly be fertilizer. If it is fertilized, the meiosis II will be completed and as a result forms ovum and a second polar body (both haploid cells