Which of the following are all components of sperm?

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: 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.

Correct Answer: C

Rationale: The correct answer is C because the endocrine role of the testicle primarily involves the secretion of testosterone. Testosterone is the main androgenic hormone produced by the testicles, which plays a crucial role in various physiological functions such as the development of male reproductive organs, sperm production, and secondary sexual characteristics. Choice A is incorrect because while interstitial cells (Leydig cells) are involved in the production of testosterone, the endocrine role of the testicle is not limited to these cells alone. Choice B is incorrect as it is too general. While androgenic hormones are indeed secreted by the testicles, testosterone specifically is the main androgenic hormone produced by them. Choice D is incorrect as the maturation of sex organs is primarily regulated by the action of testosterone but is not the sole endocrine role of the testicle.

Correct Answer: D

Rationale: The correct answer is D: seminal vesicles. Seminal vesicles are accessory glands that produce a significant portion of the fluid that makes up semen. They contribute nutrients and substances that support sperm viability and motility. Choices A, B, and C are incorrect as they are structures of the penis involved in erection and urination, not accessory glands of the male reproductive system.