Which hormone is responsible for the secretion of milk in females?

Correct Answer: A

Rationale: The correct answer is A: Prolactin. Prolactin is the hormone responsible for the secretion of milk in females. It is produced by the anterior pituitary gland and stimulates the mammary glands to produce milk. Oxytocin is also involved in milk ejection but not milk production. Estrogen and progesterone are reproductive hormones and do not directly stimulate milk production.

Correct Answer: B

Rationale: The correct answer is B: FSH (Follicle-Stimulating Hormone). FSH stimulates the Sertoli cells in the testes to promote sperm production. Testosterone (A) is responsible for male characteristics, not sperm production. LH (C) stimulates testosterone production in the testes but does not directly stimulate sperm production. Prolactin (D) is not involved in sperm production in males. Therefore, FSH is the correct choice as it directly stimulates the production of sperm in males by acting on the Sertoli cells.

Correct Answer: B

Rationale: The correct answer is B: It forms a mucous plug to protect the uterus. During pregnancy, the cervix produces a thick mucus plug that seals the opening of the uterus, providing a barrier against infections and protecting the developing fetus. This plug helps prevent bacteria from entering the uterus and causing harm. Choice A is incorrect because the cervix actually closes during pregnancy to protect the developing fetus from infections. Choice C is incorrect because while the cervix may respond to hormonal changes during pregnancy, it does not secrete estrogen to prepare the uterus. Choice D is incorrect because the production of progesterone during pregnancy primarily occurs in the ovaries and the placenta, not the cervix.

Correct Answer: C

Rationale: The myometrium is the muscular layer of the uterus responsible for contractions during labor. It helps in the expulsion of the fetus by contracting and pushing the baby out of the uterus during childbirth. This process is essential for the safe delivery of the baby. A: Facilitating implantation is the role of the endometrium, not the myometrium. B: Providing nutrients to the embryo is the function of the placenta, not the myometrium. D: Secretion of estrogen is primarily carried out by the ovaries, not the myometrium. Therefore, the correct answer is C as the myometrium plays a crucial role in the expulsion of the fetus during labor.

Correct Answer: A

Rationale: Estrogen is the correct answer as it plays a crucial role in regulating the menstrual cycle. It promotes the growth of the uterine lining and stimulates ovulation. Progesterone works in conjunction with estrogen but is primarily involved in preparing the uterus for potential pregnancy. FSH and LH are both involved in the regulation of the menstrual cycle, but they primarily stimulate the development of follicles and ovulation, respectively. Estrogen, however, is the hormone that has a direct and central role in orchestrating the entire menstrual cycle by controlling various processes like follicle development, ovulation, and the thickening of the uterine lining.