The glands that produce a thick, yellowish secretion which nourishes and activates sperm are the __

Correct Answer: A

Rationale: The correct answer is A: bulbo-urethral glands. These glands produce a thick, yellowish secretion known as pre-ejaculate or Cowper's fluid. It serves to nourish and activate sperm. The other choices are incorrect because: B: The prostate gland produces a milky fluid that helps with sperm motility. C: The seminal glands (vesicles) produce a fluid that provides energy for sperm. D: The ejaculatory duct is a passageway for semen to leave the body, it does not produce any secretions.

Correct Answer: D

Rationale: The correct answer is D: ectoderm. The primary germ layer that gives rise to structures like the lacrimal glands is the ectoderm, which is one of the three primary germ layers during embryonic development. The ectoderm gives rise to tissues such as the epidermis of the skin, nervous system, and various glands including lacrimal glands. Choice A, areolar glands to the mucosae and associated glands, is incorrect as they are derived from the mesoderm. Choice C, sweat glands, is also incorrect as they are derived from the ectoderm but are not the primary germ layer responsible for lacrimal glands. Choice B, lacrimal glands is the _______, is incorrect as it does not provide a complete statement and is not a primary germ layer.

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.