Except in the upper esophagus and stomach, the muscularis layer of the digestive tract consists of
a. one layer of skeletal muscle.
b. one layer of smooth muscle.
c. two layers of skeletal muscle.
d. two layers of smooth muscle.
e. one layer of smooth muscle and one layer of skeletal muscle.
Answer: D
Feedback : The muscularis layer of the digestive tract typically consists of two layers of smooth muscle.