Question 1

Secretion of LH and follicle-stimulating hormone (FSH) from the pituitary gland in males normally is suppressed by&#10;A) estrogen.&#10;B) prostate-specific antigen.&#10;C) cortisol.&#10;D) testosterone.

Accepted Answer

LH and FSH are both involved in male reproductive function, including the production of testosterone. Testosterone acts as a negative feedback signal to the hypothalamus and pituitary gland to suppress the secretion of LH and FSH. Therefore, in males, the secretion of LH and FSH is normally suppressed by testosterone.

Question 2

In males, pituitary luteinizing hormone (LH)&#10;A) induces Leydig cells in the testes to produce testosterone.&#10;B) induces Sertoli cells to produce sperm.&#10;C) stimulates ejaculation of semen.&#10;D) has no known reproductive function.

Accepted Answer

Pituitary LH stimulates Leydig cells in the testes to produce testosterone, which is necessary for the development of male reproductive organs, secondary sex characteristics, and sperm production.

Question 3

The male penis is innervated by the _____ nerve.&#10;A) sciatic&#10;B) sacral&#10;C) pudendal&#10;D) caudal

Accepted Answer

The pudendal nerve is responsible for innervating the genitals, including the male penis. The sciatic nerve is responsible for innervating the lower extremities, the sacral nerve is responsible for the bladder and bowel control, while the caudal nerve does not exist.

Question 4

The activation of sperm after they enter the vagina is called&#10;A) flagellation.&#10;B) ejaculation.&#10;C) emission.&#10;D) capacitation.

Accepted Answer

Capacitation is the process in which sperm undergo biochemical changes in the female reproductive tract that enable them to penetrate and fertilize the egg.

Question 5

Erection of the male penis is enhanced by penile smooth muscle relaxation.

Accepted Answer

Penile smooth muscle relaxation allows for increased blood flow into the penis, leading to an erection.

Question 6

Leydig cells produce and release sperm from the male testes.

Accepted Answer

Leydig cells are responsible for producing and releasing testosterone, which is necessary for the development and maturation of sperm in the testes. However, it is the Sertoli cells that provide the necessary environment for sperm development and release them into the tubules.

Question 7

An important function of the scrotum is to&#10;A) regulate the temperature of the testes.&#10;B) provide support to the prostate gland.&#10;C) regulate blood supply to the penis.&#10;D) supply antibacterial secretions.

Accepted Answer

The scrotum contains muscles that allow it to relax or contract, changing the distance between the testes and the body. This helps regulate the temperature of the testes, which is important for sperm production. If the testes get too hot, sperm may not be produced properly. Therefore, the scrotum plays a crucial role in maintaining fertility in males.

Question 8

More than 200 million sperm are normally stored in the epididymis.

Accepted Answer

The epididymis is a tightly coiled tubular structure located on the back of each testicle where sperm cells mature and are stored. It can hold up to 200-300 million sperm at a time.

Question 9

Erection of the male penis is regulated by parasympathetic nerves.

Accepted Answer

Parasympathetic nerves are responsible for triggering the process of vasodilation in the penile arteries, allowing for increased blood flow and ultimately leading to an erection.

Question 10

Sperm take about 1 month to mature and are released into the epididymis once every 30 days.

Accepted Answer

Sperm take about 64-75 days to fully mature and are continuously produced and stored in the epididymis until ejaculation.

Deck 30: Male Genital and Reproductive Function