During pregnancy, which of the following hormones helps prevent ovulation?

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: 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.

Correct Answer: A

Rationale: The correct answer is A: Ovary. The ovary is the primary organ responsible for producing estrogen in the female reproductive system. Estrogen is mainly produced by the ovarian follicles. It plays a crucial role in regulating the menstrual cycle, maintaining bone density, and promoting the development of female secondary sexual characteristics. The other choices, B: Uterus, C: Fallopian tube, and D: Cervix, do not produce estrogen. The uterus is responsible for implantation and gestation of a fertilized egg, the fallopian tube is where fertilization occurs, and the cervix is the lower part of the uterus that connects to the vagina.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.