What is the source of the male sex hormones?

Correct Answer: D

Rationale: The correct answer is D: interstitial cells. Interstitial cells, also known as Leydig cells, are located in the testes and are responsible for producing male sex hormones, primarily testosterone. The other choices, A: epididymis, B: vas deferens, and C: seminiferous tubules, are not directly involved in the production of male sex hormones. The epididymis is a structure for sperm maturation, the vas deferens is a duct for transporting sperm, and the seminiferous tubules are responsible for sperm production through spermatogenesis. Therefore, interstitial cells are the source of male sex hormones, making choice D the correct answer.

Correct Answer: A

Rationale: The correct answer is A: Graafian follicle. The mature follicle is called a Graafian follicle because it is the final stage of follicle development before ovulation. It is characterized by a fluid-filled cavity containing the oocyte. The other choices are incorrect because a granulosa cell is a type of cell found in the follicle wall, a primary follicle is an immature follicle, and a secondary follicle is an intermediate stage between the primary and Graafian follicle.

Correct Answer: C

Rationale: The correct answer is C: estrogen. Estrogen is a type of steroid hormone derived from cholesterol. Steroids are a specific group of lipids characterized by a particular molecular structure. Estrogen plays a vital role in the development and regulation of the female reproductive system. Choice A, FSH, and choice B, LH, are both peptide hormones, not steroids. Peptide hormones are made up of amino acids and are not derived from cholesterol. Choice D, GnRH, is also a peptide hormone that regulates the release of other hormones in the body, particularly in the reproductive system. In summary, estrogen is the only steroid hormone among the options provided, making it the correct choice.

Correct Answer: C

Rationale: The correct answer is C: increase in calcium deposition. Menopause is associated with a decrease in estrogen levels, leading to bone loss rather than an increase in calcium deposition. Loss of hormones (A) is a result of menopause due to the decline in estrogen and progesterone. Reduction in breast mass (B) occurs as estrogen levels decrease, impacting breast tissue. Psychological changes (D) such as mood swings and irritability are common during menopause due to hormonal fluctuations. Thus, an increase in calcium deposition is not a result of menopause, making choice C the correct answer.

Correct Answer: D

Rationale: The correct answer is D: Oxygenated blood. Bidder's canal is a part of the male reproductive system and functions to transport oxygenated blood to the testicles. This is essential for maintaining the temperature required for sperm production. Eggs (A) are not transported through Bidder's canal as it is specific to male reproductive functions. Sperms (B) are produced in the testicles but are not transported through Bidder's canal. Ammonia (C) is a waste product and not involved in the circulation within the male reproductive system.