What is the primary role of FSH in females?

Correct Answer: C

Rationale: The primary role of FSH in females is to stimulate follicle development. FSH promotes the growth and maturation of ovarian follicles, which contain the eggs. This process is essential for ovulation and the release of a mature egg for potential fertilization. Choice A, stimulating ovulation, is incorrect because FSH itself does not directly trigger ovulation. Choice B, supporting the development of the corpus luteum, is incorrect because it is primarily regulated by LH, not FSH. Choice D, preparing the uterus for pregnancy, is incorrect because FSH primarily acts on the ovaries, not the uterus.

Correct Answer: C

Rationale: The myometrium is the muscle layer of the uterus responsible for contracting during labor to expel the fetus. This is essential for the birthing process. Choice A is incorrect because supporting the uterine lining is the role of the endometrium. Choice B is incorrect because facilitating implantation is mainly the function of the endometrium. Choice D is incorrect because estrogen secretion is primarily regulated by the ovaries, not the myometrium. Therefore, the correct answer is C as the myometrium's main function is to assist in the expulsion of the fetus during labor.

Correct Answer: B

Rationale: The correct answer is B: Progesterone. Progesterone helps prevent ovulation during pregnancy by maintaining the uterine lining and inhibiting the release of additional eggs. Estrogen supports the development of the uterine lining but does not directly prevent ovulation. hCG is produced by the placenta to support pregnancy but does not prevent ovulation. Testosterone is not involved in regulating ovulation during pregnancy.

Correct Answer: D

Rationale: The purpose of the bulbourethral glands is to lubricate the urethra before ejaculation. This lubrication helps to neutralize any acidic urine remnants in the urethra, providing a more suitable environment for sperm to pass through. The other choices are incorrect because: A: Sperm is produced in the testes, not the bulbourethral glands. B: Testosterone is mainly produced in the testes and adrenal glands. C: Semen is produced by the seminal vesicles, prostate gland, and sperm from the testes.

Correct Answer: C

Rationale: The Leydig cells in males are responsible for producing testosterone, a key hormone that plays a crucial role in male reproductive functions such as sperm production, libido, and muscle development. This hormone is essential for the development and maintenance of male reproductive organs and secondary sexual characteristics. Leydig cells do not store sperm (Choice A), produce seminal fluid (Choice B), or mature sperm (Choice D). Testosterone production is the primary function of Leydig cells, making Choice C the correct answer.