Which of the following is not compatible with penile erection?

Correct Answer: D

Rationale: The correct answer is D: blood leaves erectile tissue. During penile erection, blood flows into the erectile tissue, causing the penis to become erect. Parasympathetic stimulation and arterial dilation are essential for promoting blood flow into the penis, while venous compression helps to trap blood within the erectile tissue, sustaining the erection. However, if blood were to leave the erectile tissue, it would result in a loss of erection. Therefore, choice D is not compatible with penile erection.

Correct Answer: D

Rationale: The correct answer is D: estrogen. Estrogen is the hormone that stimulates the growth and development of secondary female sex organs like the breasts, uterus, and fallopian tubes. It plays a crucial role in regulating the menstrual cycle and preparing the body for pregnancy. FSH and LH are hormones released by the pituitary gland that primarily regulate the ovarian cycle, while GnRH is a hormone released by the hypothalamus to stimulate the pituitary gland to release FSH and LH. Estrogen, being a primary female sex hormone, directly influences the development and function of secondary sex organs in females.

Correct Answer: B

Rationale: The correct answer is B, the uterine tube. Fertilization typically occurs in the uterine tube, also known as the fallopian tube, where the egg and sperm meet and fuse to form a zygote. This is the site where the fertilized egg begins its journey towards the uterus for implantation. The other choices are incorrect because fertilization does not occur in the uterus (A), ovary (C), or pelvic cavity (D). The uterus is where the fertilized egg implants and develops into a fetus, the ovary is where the egg is released during ovulation, and the pelvic cavity is a space that houses reproductive organs but not the site of fertilization.

Correct Answer: C

Rationale: The correct answer is C: Testosterone. Testosterone is the primary male sex hormone produced by the testes. It plays a crucial role in the development of male reproductive tissues and secondary sexual characteristics. Progesterone (A) is a female sex hormone produced in the ovaries, not the testes. Vasopressin (B) is a hormone produced by the pituitary gland, not the testes. "None of the above" (D) is incorrect as testosterone is indeed released from the testes.

Correct Answer: A

Rationale: The correct answer is A: Sperm maturation. The epididymis is a coiled tube where sperm undergo maturation, gaining motility and ability to fertilize an egg. It does not produce sperm (incorrect B), but stores sperm for a short period (incorrect C) before ejaculation. It also does not provide nutrition to sperm (incorrect D).