Three-year old Ben's parents are ecstatic because he is now using the potty each time he needs to defecate.What muscle has Ben learned to control?
A)the cardiac sphincter made of striated muscle
B)the internal anal sphincter made of smooth muscle
C)the pyloric sphincter made of smooth muscle
D)the external anal sphincter made of striated muscle
E)the Sphincter of oddi made of smooth muscle

Question

Quizplus · Accepted Answer

The external anal sphincter is the muscle that controls voluntary bowel movements. It is made of striated muscle, which means it can be controlled consciously. Therefore, Ben has learned to control this muscle to use the potty.

Three-Year Old Ben's Parents Are Ecstatic Because He Is Now