Which of the following is the correct function of the vas deferens in the male reproductive system?

Correct Answer: C

Rationale: The correct function of the vas deferens is to transport sperm from the epididymis to the urethra for ejaculation. This is a crucial step in the male reproductive system for delivering sperm during ejaculation. The other choices are incorrect because: A: The storage of sperm occurs in the epididymis, not the vas deferens. B: Secretion of seminal fluid is the role of the seminal vesicles and prostate gland, not the vas deferens. D: Testosterone production is primarily carried out by the testes, not the vas deferens.

Correct Answer: A

Rationale: The correct answer is A: Synthesize testosterone. Interstitial cells in the testes, also known as Leydig cells, are responsible for producing testosterone, the primary male sex hormone. Testosterone plays a crucial role in the development of male reproductive organs, secondary sexual characteristics, and overall reproductive function. The other choices are incorrect because storing sperm (B) is the role of the epididymis, producing seminal fluid (C) is the role of the seminal vesicles, and maturing sperm (D) occurs in the seminiferous tubules through the process of spermatogenesis.

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: Estrogen is the correct answer because it increases the permeability of the cervix to sperm during ovulation. Estrogen is responsible for the changes in cervical mucus consistency, making it easier for sperm to swim through to reach the egg. Progesterone, FSH, and LH do not directly affect cervical mucus permeability during ovulation. Progesterone prepares the uterine lining for implantation, FSH stimulates follicle growth, and LH triggers ovulation.

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.