Which of the following is a function of estrogen in females?

Correct Answer: B

Rationale: Estrogen regulates the menstrual cycle by promoting the growth of the uterine lining. It also triggers ovulation. This is a crucial function in female reproductive health. Other choices are incorrect because estrogen does not directly inhibit FSH release, support embryo implantation, or increase progesterone secretion. Estrogen's main role is in the menstrual cycle regulation.

Correct Answer: C

Rationale: The correct answer is C: Produce sperm. Seminiferous tubules are the site of spermatogenesis, the process by which sperm are produced in the testes. Sperm cells are generated through a series of cell divisions and maturation processes within the seminiferous tubules. Therefore, the primary function of the seminiferous tubules in males is to produce sperm cells. A: Store sperm - While the epididymis and vas deferens are responsible for storing sperm, the seminiferous tubules are not primarily involved in sperm storage. B: Produce seminal fluid - Seminal fluid is produced by the accessory glands such as the prostate gland and seminal vesicles, not the seminiferous tubules. D: Transport sperm - Sperm transport occurs through the vas deferens and other ducts, not within the seminiferous tubules.

Correct Answer: A

Rationale: The correct answer is A: Prolactin. Prolactin is the hormone responsible for stimulating milk production after childbirth. It is produced by the pituitary gland and plays a key role in lactation. Oxytocin, another hormone, is responsible for milk ejection during breastfeeding, not milk production. Estrogen and progesterone are involved in regulating the menstrual cycle and pregnancy, not milk production. Therefore, the correct choice is A as it directly relates to milk production post-childbirth.

Correct Answer: C

Rationale: The correct answer is C: Oxytocin. Oxytocin is the hormone responsible for stimulating uterine contractions during labor. It is produced by the hypothalamus and released by the pituitary gland. Oxytocin plays a crucial role in initiating and sustaining labor contractions by acting on the smooth muscle of the uterus. Estrogen and FSH are not directly involved in uterine contractions. Prostaglandins play a role in cervical ripening and softening but are not the primary hormone responsible for stimulating uterine contractions during labor.

Correct Answer: A

Rationale: Estrogen is the correct answer because it is responsible for thickening the cervical mucus during ovulation. Estrogen levels increase during the follicular phase of the menstrual cycle, leading to the production of thick, clear mucus that helps sperm travel to the egg for fertilization. Progesterone, FSH, and LH do not directly influence cervical mucus consistency during ovulation.