Contraction of the circular smooth muscle in the gastrointestinal tract wall decreases the diameter of the lumen,while contraction of the longitudinal smooth muscle shortens the tract.

Question

Quizplus · Accepted Answer

Contraction of the circular smooth muscle layers decreases the diameter of the lumen, which helps in mixing and propelling contents, while contraction of the longitudinal smooth muscle layers shortens the tract, aiding in the movement of food along the gastrointestinal tract.

Contraction of the Circular Smooth Muscle in the Gastrointestinal Tract