Which of the following hormones is responsible for stimulating the production of breast milk after childbirth?

Correct Answer: C

Rationale: Rationale: Prolactin is the hormone responsible for stimulating the production of breast milk after childbirth. It is produced by the pituitary gland and plays a key role in lactation. Estrogen and progesterone are involved in the menstrual cycle and pregnancy but not specifically in milk production. Oxytocin is responsible for milk ejection (letdown reflex) but not the production of milk itself. Therefore, the correct answer is C: Prolactin.

Correct Answer: B

Rationale: Correct Answer: B - Provide oxygen and nutrients to the fetus Rationale: 1. The placenta is the organ that connects the developing fetus to the uterine wall, allowing for the exchange of nutrients, oxygen, and waste products. 2. It contains blood vessels that transport oxygen and nutrients from the mother to the fetus. 3. The placenta also filters out harmful substances and waste products from the fetus. 4. Providing oxygen and nutrients is crucial for the growth and development of the fetus during pregnancy. Summary: A: Incorrect - The placenta does help in removing waste products but its primary function is not excretion. C: Incorrect - While the placenta does support implantation by attaching the embryo to the uterine wall, its main purpose is not implantation. D: Incorrect - While the placenta does produce hormones like estrogen, its primary function is to provide essential nutrients and oxygen to the fetus.

Correct Answer: C

Rationale: The primary function of the seminiferous tubules in males is to produce sperm. Sperm production, known as spermatogenesis, occurs within the seminiferous tubules through a series of cell divisions and maturation processes. This process is essential for male fertility and reproduction. Therefore, choice C is correct. Choice A (Produce seminal fluid) is incorrect because seminal fluid is primarily produced by the seminal vesicles and prostate gland. Choice B (Mature sperm) is partially correct but not the primary function of the seminiferous tubules. While sperm maturation does occur in the epididymis, the main role of the seminiferous tubules is sperm production. Choice D (Secrete testosterone) is incorrect because testosterone is primarily produced by the Leydig cells in the testes, not in the seminiferous tubules.

Correct Answer: A

Rationale: Progesterone is the correct answer as it helps prepare the uterus for pregnancy by thickening the uterine lining to support implantation of a fertilized egg. Estrogen stimulates the growth of the uterine lining. FSH and LH are involved in the regulation of the menstrual cycle and ovulation, not specifically in preparing the uterus for pregnancy.

Correct Answer: C

Rationale: The correct answer is C: Transport eggs from the ovary to the uterus. The fallopian tubes serve as a passageway for eggs released from the ovary to travel to the uterus for potential fertilization. This is a crucial function in the reproductive process. The other choices are incorrect because: A: The fallopian tubes do not transport sperm; they transport eggs. B: The production of eggs occurs in the ovaries, not in the fallopian tubes. D: Estrogen is primarily produced by the ovaries and other endocrine glands, not by the fallopian tubes.