The passage of food needs to occur in a controlled way,so the body contains rings of muscle in the digestive tract that regulate the movement of food.These are
A) rumens.
B) sphincters.
C) chymes.
D) villi.
E) uvulas.

Question

The passage of food needs to occur in a controlled way,so the body contains rings of muscle in the digestive tract that regulate the movement of food.These are 
A) rumens.
B) sphincters.
C) chymes.
D) villi.
E) uvulas.

Quizplus · Accepted Answer

Some sphincters are under voluntary control, while others are involuntary.

The Passage of Food Needs to Occur in a Controlled