What is the function of the myometrium in the uterus?

Correct Answer: C

Rationale: The myometrium is the muscle layer of the uterus responsible for contracting during labor to expel the fetus. This is essential for the birthing process. Choice A is incorrect because supporting the uterine lining is the role of the endometrium. Choice B is incorrect because facilitating implantation is mainly the function of the endometrium. Choice D is incorrect because estrogen secretion is primarily regulated by the ovaries, not the myometrium. Therefore, the correct answer is C as the myometrium's main function is to assist in the expulsion of the fetus during labor.

Correct Answer: D

Rationale: The purpose of the bulbourethral glands is to lubricate the urethra before ejaculation. This lubrication helps to neutralize any acidic urine remnants in the urethra, providing a more suitable environment for sperm to pass through. The other choices are incorrect because: A: Sperm is produced in the testes, not the bulbourethral glands. B: Testosterone is mainly produced in the testes and adrenal glands. C: Semen is produced by the seminal vesicles, prostate gland, and sperm from the testes.

Correct Answer: C

Rationale: The Leydig cells in males are responsible for producing testosterone, a key hormone that plays a crucial role in male reproductive functions such as sperm production, libido, and muscle development. This hormone is essential for the development and maintenance of male reproductive organs and secondary sexual characteristics. Leydig cells do not store sperm (Choice A), produce seminal fluid (Choice B), or mature sperm (Choice D). Testosterone production is the primary function of Leydig cells, making Choice C the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Ovary. The ovary is the primary organ responsible for producing estrogen in the female reproductive system. Estrogen is mainly produced by the ovarian follicles. It plays a crucial role in regulating the menstrual cycle, maintaining bone density, and promoting the development of female secondary sexual characteristics. The other choices, B: Uterus, C: Fallopian tube, and D: Cervix, do not produce estrogen. The uterus is responsible for implantation and gestation of a fertilized egg, the fallopian tube is where fertilization occurs, and the cervix is the lower part of the uterus that connects to the vagina.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.