Question

the wall of the gut tube has layers of smooth muscle that run both circularly and longitudinally. the contraction of these muscles produces

• deglutition
• defecation
• peristalsis
• mastication

Explanation:

Peristalsis is the wave - like muscle contractions of the smooth muscle layers (circular and longitudinal) in the gut tube. Deglutition is swallowing, defecation is elimination of feces, and mastication is chewing.

Answer:

peristalsis