What happens after vasectomy?

Options

A. Absence of semen formation
B. Sperm are dead or inactive.
C. Sperm immediately disappears in semen
D. Sperm gradually disappears in semen.

Answer

**Step-by-Step Solution:**

1. **Understanding Vasectomy:**
- Vasectomy is a surgical procedure for male sterilization or permanent contraception. It involves cutting and sealing the vas deferens, the tubes that carry sperm from the testicles to the urethra.

2. **Anatomy Involved:**
- The procedure involves the testicles, which produce sperm, the epididymis where sperm matures, and the vas deferens which transports sperm to the urethra.

3. **Effects of Vasectomy:**
- After the vas deferens is cut and sealed, sperm can no longer travel from the testicles to the urethra. This means that while sperm production continues in the testicles, they cannot be ejaculated.

4. **Analyzing the Options:**
- **Option A: Absence of semen formation.** This is incorrect because semen is produced by seminal vesicles and prostate glands, not the vas deferens.
- **Option B: Sperm are dead or inactive.** This is also incorrect as sperm are still produced but cannot reach the urethra.
- **Option C: Sperm immediately disappears in semen.** This is incorrect because sperm do not disappear immediately; they are still present for some time after the procedure.
- **Option D: Sperm gradually disappears in semen.** This is the correct answer because, over time, the sperm that were already in the reproductive tract will be absorbed or die off, leading to a gradual decrease in sperm presence in the semen.

5. **Conclusion:**
- After a vasectomy, sperm gradually disappears in the semen over time, making option D the correct answer.

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