The movement of food in food pipe is called
(a) Linear movement
(b) Rectilinear movement
(c) Smooth movement
(d) Peristaltic movement

Correct Answer: (d) Peristaltic movement

Explanation:
 The Peristaltic movement is a series of wave-like muscle contractions that moves food to different processing stations in the digestive tract. It occurs in the esophagus, intestines, and stomach.

The process of peristalsis begins in the esophagus when a bolus of food is swallowed. Thus, in the esophagus, the main function of these strong wave-like motions of the smooth muscle is to carry the food to the stomach, where it is churned into a liquid mixture called chyme.

Next, peristalsis continues in the small intestine where it mixes and shifts the chyme back and forth, allowing nutrients to be absorbed into the bloodstream through the small intestine walls.

Peristalsis concludes in the large intestine where water from the undigested food material is absorbed into the bloodstream.