What is the role of the acrosome in sperm?

Correct Answer: C

Rationale: The acrosome in sperm contains enzymes that help it penetrate the egg during fertilization. These enzymes break down the outer layer of the egg, allowing the sperm to enter and fertilize it. This makes choice C the correct answer. Choices A and D are incorrect because the acrosome is not responsible for providing energy for movement or producing enzymes for sperm maturation. Choice B is also incorrect as storing sperm is not the primary role of the acrosome.

Correct Answer: A

Rationale: Estrogen is responsible for thickening the endometrial lining during the proliferative phase of the menstrual cycle to prepare for pregnancy. It stimulates the growth and development of the endometrium. Progesterone, not FSH or LH, is responsible for maintaining the endometrial lining after it has been thickened by estrogen. FSH is involved in stimulating the growth of ovarian follicles, while LH triggers ovulation. Therefore, the correct answer is A (Estrogen) as it directly influences the thickening of the endometrial lining for pregnancy preparation.

Correct Answer: B

Rationale: The correct answer is B: hCG. Human Chorionic Gonadotropin (hCG) is produced by the placenta during pregnancy to support the corpus luteum in producing progesterone, which is essential for maintaining the pregnancy. Prolactin (A) is produced by the pituitary gland and stimulates milk production. FSH (C) is a hormone released by the pituitary gland to stimulate egg production in females. Progesterone (D) is produced by the corpus luteum and later by the placenta during pregnancy to support the uterine lining.

Correct Answer: C

Rationale: The correct answer is C: Transport eggs from the ovary to the uterus. The uterine tube, also known as the fallopian tube, is responsible for capturing the released egg from the ovary and transporting it to the uterus for potential fertilization. This transportation process is essential for successful reproduction. Storing eggs (choice A) is not the function of the uterine tube. Estrogen secretion (choice B) is primarily carried out by the ovaries and other endocrine glands, not the uterine tube. Supporting implantation of the fertilized egg (choice D) is the role of the uterus, not the uterine tube.

Correct Answer: C

Rationale: The correct answer is C because the bulbourethral glands secrete a clear fluid that helps to lubricate the urethra, making it easier for sperm to pass through during ejaculation. This lubrication also helps to neutralize any acidic urine residue in the urethra. Choice A is incorrect because sperm is produced in the testes, not the bulbourethral glands. Choice B is incorrect because semen is a mixture of sperm and seminal fluid produced by other glands such as the prostate and seminal vesicles, not the bulbourethral glands. Choice D is incorrect because the production of testosterone is primarily regulated by the hypothalamus and pituitary gland, not the bulbourethral glands.