Nokea
Testosterone is secreted by
- A. Leydig cells.
- B. Sertoli cells.
- C. spermatocytes.
- D. early spermatids.
Correct Answer: A
Rationale: Testosterone is secreted by Leydig cells in the testes. Leydig cells are interstitial cells located between the seminiferous tubules. They are responsible for producing and secreting testosterone, which plays a crucial role in stimulating the development of male secondary sexual characteristics and maintaining male reproductive functions. Sertoli cells provide nourishment and support for developing sperm cells but do not secrete testosterone. Spermatocytes and early spermatids are involved in the process of spermatogenesis and do not secrete testosterone. Therefore, the correct answer is A because Leydig cells are specifically known for their role in testosterone production.
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Anterior to the vagina and urethral openings is the
- A. Labia majora
- B. Labia minor
- C. Mons pubis
- D. Cervical sphincter
Correct Answer: A
Rationale: The correct answer is A: Labia majora. The labia majora are located anterior to the vagina and urethral openings, providing protection and support. The labia minora are internal to the labia majora. The mons pubis is the rounded mass of fatty tissue located over the pubic symphysis. Cervical sphincter is not a relevant anatomical structure in this context. Therefore, the labia majora is the correct choice based on its anatomical location and function.
The ejaculatory duct:
- A. forms by the joining of the deferent duct with the seminal vesicle duct;
- B. opens in the urethra;
- C. is an extratesticular spermatic duct;
- D. is an intratesticular spermatic duct;
Correct Answer: A
Rationale: The correct answer is A because the ejaculatory duct is formed by the joining of the deferent duct (vas deferens) with the seminal vesicle duct. This is important for transporting sperm and seminal fluid towards the urethra for ejaculation. Choice B is incorrect because the ejaculatory duct does not open directly into the urethra; rather, it joins with the urethra. Choice C is incorrect as the ejaculatory duct is not extratesticular; it is located within the prostate gland. Choice D is incorrect as the ejaculatory duct is not located within the testicle; it is formed outside the testicle by the union of other structures.
Levels of transcortin are elevated in a pregnant woman. Which of the following laboratory findings would be expected in this patient?
- A. Increased total (protein-bound plus free) plasma cortisol concentration
- B. Increased free (non–protein-bound) plasma cortisol concentration
- C. Decreased total plasma cortisol concentration
- D. Decreased free plasma cortisol concentration
Correct Answer: A
Rationale: Rationale: Elevated levels of transcortin in a pregnant woman lead to an increase in total plasma cortisol concentration. Transcortin binds to cortisol, increasing its total concentration but reducing the amount of free (non-protein-bound) cortisol. Choice A is correct as total cortisol concentration increases due to transcortin binding. Choices B and D are incorrect as free cortisol concentration decreases. Choice C is incorrect as total cortisol concentration is elevated, not decreased.
Which is a sign of benign prostatic hyperplasia?
- A. Weight loss
- B. Bone pain
- C. Fever
- D. Nocturia
Correct Answer: D
Rationale: The correct answer is D: Nocturia. Benign prostatic hyperplasia (BPH) is a non-cancerous enlargement of the prostate gland, leading to urinary symptoms like frequent urination, especially at night (nocturia). Weight loss, bone pain, and fever are not typical signs of BPH. Nocturia is a common symptom due to the prostate gland pressing against the urethra, causing urinary retention. It is important to differentiate BPH symptoms from other potential causes to provide appropriate treatment.
Approximately how many sperm are normal ejaculated during intercourse.
- A. 4,000
- B. 40,000
- C. 400,000,000
- D. 4,000,000
Correct Answer: C
Rationale: The correct answer is C: 400,000,000. During ejaculation, a healthy male typically releases around 200-500 million sperm cells. Choice A (4,000) and B (40,000) are too low compared to the average sperm count. Choice D (4,000,000) is also significantly lower than the typical sperm count, making it incorrect. Therefore, C is the correct answer as it aligns with the standard range of sperm count during ejaculation.