Milky-colored fluids secreted from the

Correct Answer: B

Rationale: The correct answer is B: bulbo-urethral glands. These glands secrete a milky-colored fluid called pre-ejaculate or Cowper's fluid, which lubricates the urethra and neutralizes any acidic urine residue to protect sperm. The other choices are incorrect because the epididymis (A) stores and matures sperm, the prostate (D) secretes a milky fluid that nourishes and protects sperm, and option C is incomplete.

Correct Answer: A

Rationale: The correct answer is A: acrosome, flagellum, nucleus. The acrosome contains enzymes for penetrating the egg. The flagellum is the tail for movement. The nucleus contains genetic material. Choice B is incorrect because a codpiece is a protective garment and not a component of sperm. Choice C is incorrect because seminal vesicles and mitochondria are not components of sperm. Choice D is incorrect because efferent ductules are part of the male reproductive system, not a component of sperm.

Correct Answer: A

Rationale: Inhibin is secreted by Sertoli cells to inhibit follicle stimulating hormone (FSH) from the anterior pituitary. This is the correct answer because inhibin acts as a negative feedback mechanism to regulate FSH levels in the body. Sertoli cells are specifically involved in spermatogenesis and play a crucial role in regulating FSH secretion through inhibin. Choices B, C, and D are incorrect because inhibin does not inhibit testosterone secretion or act on Leydig cells. It specifically targets FSH secretion to regulate the process of spermatogenesis.

Correct Answer: C

Rationale: The correct answer is C: Cervix. The cervix is the opening to the uterus, allowing passage of sperm into the uterus and menstrual blood out of the uterus. The vagina (A) is the canal leading from the cervix to the outside of the body. The ovary (B) is responsible for producing eggs and hormones but is not the opening to the uterus. Hypermenorrhoea (D) refers to excessive menstrual bleeding and is not related to the opening to the uterus.

Correct Answer: D

Rationale: The correct answer is D: menstruation. Day 1 of the menstrual cycle is the first day of menstruation, which typically lasts around 3-7 days. Menstruation is the shedding of the uterine lining when pregnancy has not occurred. This marks the beginning of a new cycle. Menopause (A) is the cessation of menstruation and fertility typically occurring in women in their 40s-50s. Ovulation (B) is the release of an egg from the ovary, usually occurring around day 14 of the cycle. Implantation (C) is the attachment of a fertilized egg to the uterus, which occurs around 6-10 days after ovulation.