If peristalsis in the esophagus is insufficient to carry a large bolus to the stomach,
A)a secondary peristaltic wave is initiated by the swallowing center
B)a secondary peristaltic wave is initiated and, mediated by the intrinsic nerve plexuses
C)the food remains in the esophagus until voluntary swallowing is initiated again
D)increased esophageal secretion lubricates the bolus so that it can slide to the stomach
E)food never becomes stuck because the esophagus is very distensible

Question

Quizplus · Accepted Answer

In order to move a large bolus of food through the esophagus, a secondary peristaltic wave is initiated and mediated by the intrinsic nerve plexuses. This wave propels food towards the stomach even if the primary peristaltic wave was insufficient to complete the job. A secondary peristaltic wave is initiated by the swallowing center and mediated by the intrinsic nerve plexuses as well. Hence, option B is the correct answer. Option A is partially correct, but it does not mention the role of intrinsic nerve plexuses. Option C is incorrect because peristaltic waves will eventually move the food down, even if it takes a while, and voluntary swallowing wouldn't be necessary. Option D is also incorrect because, although secretions do help with lubrication, they don't play a significant role in moving food down the esophagus. Option E is incorrect because, while the esophagus is stretchy, food can still get stuck if peristaltic waves are insufficient.

If Peristalsis in the Esophagus Is Insufficient to Carry a Large