Question at position 36 In a vasectomy, a section of the vas deferens is cut and sealed. This functions as a form of contraception bypreventing the transportation of sperm cells from the testes to the urethrastopping the production of sperm cellsblocking the secretions from the seminal vesicles, which stops the sperm cells from maturingstopping the production of testosteroneClear my selection

Question

BlackTom AI · Accepted Answer

The vas deferens carries sperm from the epididymis to the urethra, so cutting and sealing it prevents sperm from being included in ejaculate.

1. Relevant knowledge points and concepts
- Pathway of sperm: seminiferous tubules → epididymis (maturation/storage) → vas deferens → ejaculatory ducts → urethra.
- Vasectomy: a surgical procedure that severs and seals a segment of each vas deferens.
- Spermatogenesis occurs in the testes (seminiferous tubules) and is hormonally driven by testosterone from Leydig cells.
- Seminal vesicles contribute fluid to semen but are not responsible for sperm maturation.

2. Complete reasoning process, step by step
- Sperm are produced in the testes and mature in the epididymis; they travel through the vas deferens during ejaculation.
- A vasectomy interrupts the continuity of the vas deferens by cutting and sealing it.
- When the vas deferens are severed, sperm cannot pass from the epididymis into the ejaculatory ducts and urethra.
- Ejaculate after vasectomy contains seminal fluid from prostate and seminal vesicles but no sperm from the testes, preventing fertilization.

3. Calculations/intermediate steps
- No numerical calculations apply. Logical sequence: production (testes) → route (vas deferens) → interruption (cut/seal) → effect (no sperm in ejaculate).

4. Why the correct answer is correct
- Because the vas deferens is the physical transport route for sperm, obstructing it directly prevents sperm reaching the urethra and being expelled during ejaculation, thus providing contraception without altering sperm production or hormonal function.

5. Why the other options are incorrect
- "Stopping the production of sperm cells": incorrect — testes continue spermatogenesis after vasectomy.
- "Blocking the secretions from the seminal vesicles, which stops the sperm cells from maturing": incorrect — seminal vesicle secretions add fluid to semen but do not mature sperm; maturation occurs in the epididymis.
- "Stopping the production of testosterone": incorrect — Leydig cells in the testes continue producing testosterone; vasectomy does not affect endocrine function.

6. Conclusion confirming the answer
- Therefore, the correct answer is preventing the transportation of sperm cells from the testes to the urethra, which matches the provided answer.

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