Question 125 of 782
In man, spermatozoa are never found in the?
- A. testis
- B. urethra
- C. epididymis
- D. prostrate glands
Correct Answer:
D
Explanation
The correct option is
D. prostrate glands.
Detailed Explanation:
- Understanding the Anatomy:
- Testis: This is the primary male reproductive organ where spermatozoa (sperm cells) are produced through a process called spermatogenesis. The testis contains seminiferous tubules where the sperm cells develop.
- Urethra: This is a tube that carries urine from the bladder and semen from the reproductive system out of the body. Spermatozoa can be found in the urethra during ejaculation.
- Epididymis: This is a coiled tube located at the back of each testis where sperm mature and are stored. Spermatozoa are definitely present here as they undergo maturation.
-
Prostate Glands: The prostate gland is a gland that produces a fluid that nourishes and transports sperm. However, it does not produce sperm itself. Instead, it contributes to the seminal fluid that carries sperm during ejaculation.
-
Why Option D is Correct:
-
Spermatozoa are produced in the testis and stored in the epididymis. They travel through the vas deferens and mix with fluids from the seminal vesicles and prostate gland to form semen. However, the prostate gland does not contain spermatozoa; it only contributes to the fluid that helps transport sperm. Therefore, spermatozoa are never found in the prostate gland itself.
-
Why the Other Options are Incorrect:
- Option A (Testis): This is incorrect because spermatozoa are indeed produced in the testis. It is the primary site of sperm production.
- Option B (Urethra): This is incorrect because spermatozoa are present in the urethra during ejaculation. The urethra serves as the passage for sperm to exit the body.
- Option C (Epididymis): This is incorrect because spermatozoa are stored and mature in the epididymis. It is a crucial part of the male reproductive system where sperm gain motility and the ability to fertilize an egg.
Summary of Key Points:
- Spermatozoa are produced in the testis and stored in the epididymis.
- The urethra carries sperm during ejaculation, so spermatozoa are present there.
- The prostate gland contributes to seminal fluid but does not contain spermatozoa.
- Therefore, the only location where spermatozoa are never found is the prostate gland.
Revision Summary:
- Spermatozoa are produced in the testis and stored in the epididymis.
- The urethra is a passage for sperm during ejaculation.
- The prostate gland produces fluid but does not contain spermatozoa.
- Correct answer: D. prostrate glands.