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The Male Reproductive System > Maternal Newborn

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Practice Questions 1

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Total Questions : 6

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Question 1:

Which structure is responsible for producing male gametes?

A. Epididymis B. Testes C. Prostate gland D. Seminal vesicles

Answer and Explanation

Choice A:

The epididymis does not produce gametes; it functions as the site for sperm maturation and storage after spermatogenesis has already occurred in the testes. Sperm in the epididymis gain motility but are not formed there.

Choice B:

The testes contain seminiferous tubules, which directly produce male gametes (spermatozoa) through spermatogenesis. The question asks specifically about the structure producing male gametes, making testes the direct and scientifically correct choice.Rationale for incorrect answers

Choice C:

The prostate gland produces prostatic fluid, which contributes to seminal fluid composition, enhancing sperm motility and longevity. It has no role in the actual production of male gametes.

Choice D:

The seminal vesicles secrete fructose-rich fluid that provides an energy source for sperm. This structure is accessory to reproduction but does not produce spermatozoa.

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Question 2:

During penile erection, which physiological process occurs?

A. Sympathetic-induced vasoconstriction B. Parasympathetic-induced vasodilation C. Hormonal suppression of testosterone D. Urethral sphincter contraction

Answer and Explanation

Choice A:

Sympathetic-induced vasoconstriction reduces arterial inflow, leading to detumescence. This is opposite to the mechanism required for initiating and maintaining penile erection.

Choice B:

Parasympathetic activation via S2–S4 induces nitric oxide release, causing smooth muscle relaxation and vasodilation in penile erectile tissue, allowing engorgement with blood. This process is the primary mechanism of erection.Rationale for incorrect answers

Choice C:

Testosterone production is not suppressed during erection; instead, it remains essential for maintaining libido and normal erectile function. Hormonal suppression is unrelated to the acute hemodynamic process.

Choice D:

Urethral sphincter contraction occurs during ejaculation to prevent retrograde flow of semen into the bladder. It is not part of the mechanism initiating penile erection.

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Question 3:

Select all functions of the scrotum.

A. Protects the testes from mechanical injury B. Produces testosterone C. Regulates testicular temperature D. Facilitates sperm maturation E. Stores mature sperm

Answer and Explanation

Choice A:

The scrotum encases the testes within a protective sac of skin, connective tissue, and muscle layers, reducing the risk of direct mechanical injury.

Choice B:

Testosterone production is a function of Leydig cells located within the testes, not the scrotum. The scrotum only houses the testes and aids in their protection and cooling.

Choice C:

The scrotum regulates temperature through contraction/relaxation of the dartos and cremaster muscles, ensuring an optimal testicular environment for spermatogenesis.Rationale for incorrect answers

Choice D:

Sperm maturation occurs in the epididymis, where sperm acquire motility and fertilizing capacity, not in the scrotum.

Choice E:

Mature sperm are stored in the epididymis, particularly in its tail, not in the scrotum itself.

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Question 4:

Which muscle contracts to elevate the testes in response to cold?

A. Dartos muscle B. Cremaster muscle C. Bulbospongiosus muscle D. Ischiocavernosus muscle

Answer and Explanation

Choice A:

The dartos muscle is a smooth muscle in the scrotal wall that wrinkles the skin to reduce surface area and limit heat loss but does not elevate the testes.

Choice B:

The cremaster muscle elevates the testes toward the body during cold exposure, reducing heat loss and maintaining the optimal temperature for sperm production.Rationale for incorrect answers

Choice C:

The bulbospongiosus muscle surrounds the bulb of the penis and aids in ejaculation and expulsion of urine, not thermoregulation of testes.

Choice D:

The ischiocavernosus muscle compresses the crus of the penis during erection to maintain rigidity, unrelated to testicular elevation or temperature control.

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Question 5:

The glans penis is:

A. The attached base of the penis B. The expanded distal end of the corpus spongiosum C. The outer covering of the penile shaft D. The erectile tissue surrounding the urethra

Answer and Explanation

Choice A:

The attached base of the penis is called the root, composed of the bulb and crura, not the glans.

Choice B:

structure and location match the definition exactly.
Rationale for incorrect answers

Choice C:

The outer covering of the penile shaft is skin and superficial fascia, not the glans penis.

Choice D:

The erectile tissue surrounding the urethra is the entire corpus spongiosum, not just the glans. The glans is only its distal expansion.

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Question 6:

Select all functions of the epididymis.

A. Sperm maturation B. Testosterone secretion C. Sperm storage D. Spermatogenesis E. Reabsorption of unused sperm

Answer and Explanation

Choice A:

The epididymis provides the environment for sperm to mature, gaining motility and the ability to fertilize.

Choice B:

Testosterone secretion occurs in Leydig cells of the testes under LH stimulation, not in the epididymis.

Choice C:

Mature sperm are stored in the tail of the epididymis until ejaculation.

Choice D:

Spermatogenesis takes place in the seminiferous tubules of the testes, not in the epididymis. The epididymis only handles post-testicular sperm handling.

Choice E:

The epididymis reabsorbs sperm not ejaculated, preventing accumulation and maintaining optimal conditions for new sperm.Rationale for incorrect answers

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