During pregnancy, which of the following hormones supports the development of the fetus?

Correct Answer: D

Rationale: Correct Answer: D - Progesterone Rationale: 1. Progesterone maintains the uterine lining for implantation and supports fetal development. 2. It inhibits contractions to prevent premature labor. 3. Estrogen helps with fetal development but is not the primary hormone during pregnancy. 4. Prolactin is responsible for milk production after birth, not fetal development. 5. hCG is produced early in pregnancy but does not directly support fetal development.

Correct Answer: A

Rationale: The correct answer is A: Nourish the embryo. During pregnancy, the uterine lining, also known as the endometrium, thickens to provide a rich blood supply and nutrients to support the developing embryo. This lining helps in implantation and facilitates the exchange of oxygen, nutrients, and waste products between the mother and the embryo. Choice B is incorrect as uterine contractions are primarily controlled by the muscles of the uterus. Choice C is incorrect because the uterine lining does not directly support the fetus during delivery; rather, it is the uterine muscles that aid in labor. Choice D is incorrect as the placenta, not the uterine lining, is responsible for providing nutrients to the fetus.

Correct Answer: C

Rationale: The correct answer is C: Provide sexual pleasure. The clitoris is a highly sensitive organ with numerous nerve endings, making it a key structure for sexual arousal and pleasure in females. Stimulation of the clitoris can lead to sexual satisfaction and orgasm. Choices A, B, and D are incorrect because the clitoris does not provide support for the uterus, facilitate sperm entry, or support the vaginal walls. It is important to differentiate between the functions of different reproductive organs to understand their roles in the body.

Correct Answer: B

Rationale: The correct answer is B: Passage for sperm into the uterus. Rationale: 1. The vagina serves as a pathway for sperm to travel from the male reproductive system into the female reproductive system. 2. Sperm must travel through the vagina to reach the cervix, uterus, and fallopian tubes for fertilization to occur. 3. The vagina also provides a passageway for the delivery of the baby during childbirth. Summary: A: Production of eggs - Incorrect. Eggs are produced in the ovaries, not the vagina. C: Secretion of estrogen - Incorrect. Estrogen is produced by the ovaries and plays a role in the menstrual cycle, not in the vagina. D: Site of fertilization - Incorrect. Fertilization typically occurs in the fallopian tubes, not the vagina.

Correct Answer: B

Rationale: The correct answer is B: Leydig cells secrete testosterone. These specialized cells are located in the testes and are responsible for producing and releasing testosterone, the primary male sex hormone. Testosterone plays a crucial role in the development of male reproductive organs, sperm production, sex drive, and secondary sexual characteristics. Choice A is incorrect because sperm production is primarily carried out by the Sertoli cells. Choice C is incorrect as Leydig cells do not store sperm. Choice D is incorrect as sperm transport is mainly facilitated by the vas deferens and other structures in the male reproductive system.