What is the function of the seminal vesicles in males?

Correct Answer: B

Rationale: The correct answer is B: Secrete seminal fluid. Seminal vesicles produce and secrete seminal fluid, which is a major component of semen. This fluid provides nutrients and protection for sperm, aiding in their motility and survival. Storing sperm (choice A) is primarily the function of the epididymis. Testosterone production (choice C) occurs in the testes, while sperm production (choice D) takes place in the testes as well. Therefore, choice B is the correct answer as seminal vesicles specifically contribute to the production of seminal fluid.

Correct Answer: B

Rationale: The correct answer is B: Stimulate uterine contractions. Oxytocin is a hormone that plays a key role in initiating and maintaining labor by stimulating uterine contractions. It acts on the smooth muscles of the uterus to promote the rhythmic contractions necessary for childbirth. Oxytocin also helps with the ejection of milk during breastfeeding but its primary role in childbirth is to stimulate uterine contractions. Incorrect choices: A: Inhibit uterine contractions - This is incorrect as oxytocin actually stimulates, not inhibits, uterine contractions. C: Increase milk production - While oxytocin does play a role in milk ejection during breastfeeding, its primary role in childbirth is to stimulate uterine contractions. D: Prepare the cervix for dilation - While oxytocin may contribute to cervical dilation during labor, its primary role is in stimulating uterine contractions.

Correct Answer: B

Rationale: The correct answer is B: Control the development of male secondary sexual characteristics. Testosterone plays a crucial role in the development of traits like facial hair, deep voice, muscle growth, and bone density in males. It is responsible for the physical characteristics that distinguish males from females. Choices A, C, and D are incorrect as testosterone primarily influences male sexual characteristics and does not directly impact sperm production, menstrual cycle regulation, or seminal fluid secretion.

Correct Answer: B

Rationale: Progesterone's role in the female reproductive system is to prepare the uterus for implantation by thickening the uterine lining. This is essential for successful implantation of a fertilized egg. Progesterone does not stimulate ovulation (which is mainly regulated by luteinizing hormone), prevent pregnancy (contraceptives containing progesterone are used for this purpose), or promote the development of secondary sexual characteristics (which is primarily the role of estrogen).

Correct Answer: B

Rationale: The acrosome in sperm contains enzymes that help the sperm penetrate the outer layer of the egg during fertilization. This process is crucial for successful fertilization. The other choices are incorrect because: A) Energy for sperm comes from mitochondria, not the acrosome. C) Sperm are stored in the epididymis, not the acrosome. D) Genetic material is stored in the nucleus of the sperm cell, not the acrosome. Therefore, the correct answer is B as the acrosome's function is directly related to the penetration of the egg during fertilization.