Which structure stores sperm after they are produced in the testes?

Correct Answer: C

Rationale: The correct answer is C: Epididymis. The epididymis is a coiled tube located on top of the testes where sperm are stored after production. It allows for maturation and storage of sperm before they are ejaculated. The other choices, A: Seminal vesicle, B: Vas deferens, and D: Prostate gland, do not store sperm. The seminal vesicle produces seminal fluid, the vas deferens transports sperm from the testes to the urethra, and the prostate gland secretes fluid that nourishes and protects sperm. Therefore, the epididymis is the correct choice as it specifically stores sperm after production.

Correct Answer: A

Rationale: Step 1: Oxytocin is known as the "love hormone" and plays a crucial role in uterine contractions. Step 2: During labor, oxytocin is released to stimulate rhythmic contractions of the uterus. Step 3: These contractions help to push the baby through the birth canal. Step 4: Therefore, the primary purpose of oxytocin during labor is to stimulate uterine contractions for the progression of labor. Summary: Choice A is correct because oxytocin's main function during labor is to stimulate uterine contractions. Choices B, C, and D are incorrect as oxytocin does not inhibit contractions, increase progesterone production, or directly prepare the cervix for dilation during labor.

Correct Answer: A

Rationale: The correct answer is A: Testosterone. Testosterone is the primary male sex hormone responsible for the development of secondary sexual characteristics such as facial hair, deepening of the voice, and muscle growth. It is produced by the testes in males. Estrogen (B) and Progesterone (C) are female sex hormones, while LH (D) is luteinizing hormone that stimulates the production of testosterone in males but is not responsible for the development of secondary sexual characteristics.

Correct Answer: C

Rationale: The correct answer is C because the fallopian tubes transport the ovum from the ovary to the uterus for fertilization. This is their primary function in the reproductive system. Choice A is incorrect because the ovaries produce eggs, not the fallopian tubes. Choice B is incorrect as the fallopian tubes do not transport sperm but rather the egg. Choice D is also incorrect because estrogen is produced by the ovaries and other tissues, not by the fallopian tubes. In summary, the fallopian tubes serve as a pathway for the ovum to travel from the ovary to the uterus for potential fertilization.

Correct Answer: C

Rationale: Estrogen's primary function is to stimulate the development of female secondary sexual characteristics such as breast development and widening of the hips. This is crucial for the maturation of the female reproductive system. Estrogen does not directly regulate ovulation (choice A), support pregnancy (choice B), or control the menstrual cycle (choice D). Ovulation is mainly regulated by luteinizing hormone and follicle-stimulating hormone, pregnancy is supported by progesterone, and the menstrual cycle is under the control of various hormones including estrogen and progesterone.