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Which of the following involves skeletal muscle?
a. contraction of the internal urethral sphincter
b. contraction of the external urethral sphincter
c. ureteral peristalsis
d. detrusor muscle contraction
The detrusor muscle, internal urethral sphincter and the smooth muscle cells of the ureters are under control by parasympathetic nervous system, while the external urethral sphincter is composed of skeletal muscle fibers so its contraction and relaxation are under our voluntary control.
The external urethral sphincter is made of skeletal muscle and is under voluntary control. This can remain contracted, which narrows the urethra up until the person opts to urinate.
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