Question

How does peristalsis in different parts of the alimentary canal?

A. In some parts of the alimentary canal, peristalsis involves only contraction
B. In some parts of the alimentary canal, peristalsis involves only relaxation
C. Peristalsis can involve smaller waves in the esophagus and bigger waves in the intestines
D. Peristalsis can involve bigger waves in the esophagus and smaller waves in the intestines

Answer 1

Peristalsis varies throughout the alimentary canal, with different parts like the esophagus and intestines experiencing waves of varying sizes, but always involving both muscular contraction and relaxation. Option c.

Step-by-step explanation:

​Peristalsis is the rhythmic contraction and relaxation of muscles in the alimentary canal that propels food along the digestive tract. This process can vary in its characteristics, such as the size of the peristaltic waves, across different parts of the GI tract. For instance, the peristalsis in the esophagus may involve smaller waves, while in the intestines, the waves can be bigger and more forceful to move the contents effectively. Option c. Regardless of the size of the waves, peristalsis involves both contraction and relaxation phases, not just one or the other. The process is essential for moving food from the mouth to the stomach and through the intestines until waste is expelled from the body.