Question

Peristalsis only occurs in the esophagus. a) is a condition wherein the lining of the digestive tract is irritated by the passage of rough fibrous material. b) is waves of muscular contractions that move along the length of the digestive tract. c) is a muscular movement pattern that occurs in regions of the digestive tract where the smooth muscle fibers are not arranged in layers.

Answer 1

Answer: b) is waves of muscular contractions that move along the length of the digestive tract.

Explanation:

a) is not right, since the movement is triggered by a signal sent to the brain, which coordinates the movements.

c) is not right, since the esophagus smooth muscle is arranged in circular and longitudinal muscle layers.

NOTE: the peristalsis do not only ocurrs in the esophagus. It also occurs in all the digestive tract, as well as in the bile conducts and also in the urinary system, to conduct the urine from the kidneys to the bladder.