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)Ejaculation is a parasympathetic reflex resulting in no response by urinary contraction muscles.
C)The smooth muscle sphincter at the base of the urinary bladder closes.
D)There is no urge to urinate during sexual intercourse because of the suppression of LH by testosterone buildup in the blood.

Question

Quizplus · Accepted Answer

The smooth muscle sphincter at the base of the urinary bladder closes during ejaculation, preventing the entry of semen into the bladder. This is due to the contraction of the smooth muscle that forms the internal urethral sphincter, which is controlled by the autonomic nervous system.

Why Doesn't Semen Enter the Urinary Bladder During Ejaculation