Which mechanism explains why fertilization is blocked in individuals with severe cystic fibrosis affecting the vas deferens?

💡 Explanation

Fertilization is blocked in cystic fibrosis patients with congenital bilateral absence of the vas deferens because the vas deferens fails to develop properly, preventing sperm transport; therefore, the sperm cannot reach the egg for fertilization, rather than the other mechanisms affecting sperm function or hormonal regulation.

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