Which of the following is a sign of pregnancy?

Correct Answer: A

Rationale: Morning sickness is a common sign of pregnancy caused by hormonal changes. It typically occurs in the first trimester. The other choices are not signs of pregnancy. Luteal phase defect is a menstrual cycle disorder, mature corpus luteum is a normal part of the menstrual cycle, and dysmenorrhea is painful periods. Thus, A is the correct answer as it directly relates to pregnancy.

Correct Answer: A

Rationale: The correct answer is A: Seminal vesicles. Seminal vesicles are responsible for producing the majority of the fluid in semen, contributing to sperm motility and viability. The other choices are incorrect because: B: Epididymis stores and transports sperm; C: Testes produce sperm; D: Vas deferens transports sperm from the epididymis to the urethra.

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.