Which statement about movement of food in the gut is true?
A) There are two sphincters in the vertebrate gut, one at the anterior end and one at the posterior end.
B) Peristalsis is under voluntary control.
C) Smooth muscle of the gut contracts in response to being stretched.
D) Peristalsis begins when food enters the glottis.
E) The muscle in a sphincter is normally relaxed.

Question

Quizplus · Accepted Answer

Smooth muscle of the gut contracts in response to being stretched, which helps move food along the digestive tract.

Answer: E
 The muscle in a sphincter is normally relaxed to allow food to pass through, and only contracts to prevent backflow or to control the rate of flow.

Therefore, both statements C and E are true.

Which Statement About Movement of Food in the Gut Is