Why doesn't semen enter the urinary bladder during ejaculation?
A) There is no common duct between the reproductive system and the urinary system.
B) There is no urge to urinate during sexual intercourse because of the suppression of LH by testosterone buildup in the blood.
C) The smooth muscle sphincter at the base of the urinary bladder closes.
D) Ejaculation is a parasympathetic reflex resulting in no response by urinary contraction muscles.

Question

Quizplus · Accepted Answer

The smooth muscle sphincter at the base of the urinary bladder closes during ejaculation, preventing semen from entering the urinary bladder. This is due to the contraction of the smooth muscles in the vas deferens and seminal vesicles, which propels the semen forward towards the urethra, while the bladder neck sphincter closes to prevent retrograde ejaculation.

Why Doesn't Semen Enter the Urinary Bladder During Ejaculation