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Reflex closure of sphincter muscles guarding the bladder opening
✦ During ejaculation, reflex closure of the internal urethral sphincter at the bladder neck prevents urine from entering the urethra.
✦ This reflex action ensures that semen passes only through the urethra without contamination by urine.
✦ The mechanism is involuntary and coordinated by the autonomic nervous system, not conscious control.
✦ This is essential for both fertility and urinary tract protection, as urine is acidic and could damage sperm cells.
This question is from BIO 142 Anatomy & Physiology which contains 50 questions.
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