With respect to the effects of testosterone in the male which statement is incorrect?

Correct Answer: B

Rationale: The correct answer is B because inhibin is primarily secreted by Sertoli cells in the testes, not Leydig cells. Testosterone actually stimulates the secretion of inhibin from Sertoli cells. In contrast, Leydig cells produce testosterone in response to luteinising hormone (Choice A). Testosterone does play a key role in inducing and maintaining male sexual functions (Choice C) and also stimulates protein anabolism and bone growth (Choice D). Thus, Choice B is incorrect as Leydig cells do not secrete inhibin.

Correct Answer: B

Rationale: The correct answer is B: neonate. A neonate refers to a newborn baby within the first 28 days of life. The term is commonly used in medical contexts to describe infants right after birth. Rationale: 1. Obstetrician (Choice A): An obstetrician is a doctor who specializes in pregnancy, childbirth, and postpartum care. This term does not describe the baby itself. 2. Antenatal (Choice C): Antenatal refers to the period before birth, specifically during pregnancy. It does not describe the baby after birth. 3. Foetus (Choice D): A foetus is the term used for an unborn baby in the womb, not for a newborn baby after birth. In summary, the term "neonate" is the correct choice as it specifically refers to a newborn baby immediately after birth, while the other options do not accurately describe the baby at this stage.

Correct Answer: C

Rationale: The correct answer is C because testicular lobules are indeed made up of 2-3 convoluted seminiferous tubules where spermatogenesis occurs. This process of sperm production takes place within the seminiferous tubules, making option C the most accurate description of the testicular lobules. A is incorrect because the testicular lobules are not delineated by connective septa separated from the tunica albuginea. B is also incorrect as interstitial tissue is found between the lobules, not separating each individual lobule. D is incorrect as spermatogenesis specifically occurs within the seminiferous tubules, not at the level of the testicular lobules.

Correct Answer: D

Rationale: The correct answer is D: prostate. The prostate is an internal male reproductive organ located below the bladder. Step-by-step rationale: A - The penis is an external male genital organ. B - Seminal ducts are also known as vas deferens and are part of the male reproductive system. C - The corpus spongiosum is a spongy tissue structure found in the penis. Thus, the prostate is the only internal organ listed, making it the correct answer.

Correct Answer: A

Rationale: Step-by-step rationale: 1. The prostate gland secretes a milky fluid that constitutes a major portion of semen. 2. This prostatic fluid contains enzymes, citric acid, and zinc, which nourish and protect sperm. 3. Seminal vesicles also contribute to semen production, but mainly by providing fructose for sperm energy. 4. The scrotum houses the testes but does not directly contribute fluids to semen. 5. The epididymal duct is a site for sperm maturation and storage but does not produce semen fluids. Summary: Choice A is correct because the prostate gland secretes a significant portion of semen. Choices B, C, and D are incorrect because they do not directly contribute fluids to semen production.