Which of the following hormones stimulates the release of eggs from the ovaries?

Correct Answer: D

Rationale: The correct answer is D: LH (luteinizing hormone). LH is responsible for stimulating the release of eggs from the ovaries during ovulation. This hormone triggers the final maturation and release of the egg from the ovarian follicle. Estrogen and progesterone play roles in the menstrual cycle but do not directly stimulate egg release. FSH (follicle-stimulating hormone) is involved in follicle development but does not trigger egg release. Therefore, LH is the correct choice for its specific role in ovulation.

Correct Answer: D

Rationale: The primary function of the uterine tubes (fallopian tubes) is to transport eggs from the ovary to the uterus for potential fertilization. This process involves capturing an egg released from the ovary, providing a site for fertilization by sperm, and conducting the fertilized egg (zygote) to the uterus for implantation. Choice A is incorrect because sperm are not transported through the fallopian tubes. Choice B is incorrect as the fallopian tubes do not store eggs but rather facilitate their movement. Choice C is incorrect as fertilization occurs in the fallopian tubes but they do not actively support the process.

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).