The muscularis externa contains which of the following muscle groups?
A) an outer longitudinal layer that requires neural input for contraction
B) a muscularis mucosae, which lubricates as it contracts
C) an inner circular layer capable of slow -wave potentials only
D) both an inner circular and an outer longitudinal layer
E) an inner circular and outer longitudinal layer, and a muscularis mucosae

Question

Quizplus · Accepted Answer

The muscularis externa in the gastrointestinal tract typically consists of two main layers of muscle: an inner circular layer and an outer longitudinal layer. These layers are responsible for the peristaltic movements that propel food through the digestive system.

The Muscularis Externa Contains Which of the Following Muscle Groups