The Urinary Bladder

Question

The urinary bladder
A) contains only skeletal muscle.
B) receives urine from two urethras.
C) causes diuresis in response to ADH deficiency.
D) causes micturition when the detrusor muscle contracts and the internal sphincter relaxes.

Accepted Answer

The detrusor muscle contracting and the internal sphincter relaxing are the actions that lead to micturition, or the expulsion of urine from the bladder. Choices A and B are incorrect because the urinary bladder contains both smooth and skeletal muscle, and it receives urine from one urethra in males and one orifice in females. Choice C is incorrect because ADH deficiency would actually cause less urine production and therefore less need for diuresis.