Question 1

Which of the following best describes the function of the pyloric valve during gastric motility, as shown in the image?

Accepted Answer

It regulates the passage of small amounts of chyme into the duodenum, preventing overfilling.

Question 2

During the 'grinding' phase of gastric motility, which of the following occurs?

Accepted Answer

The most vigorous peristalsis and mixing occur near the pylorus, delivering small amounts of chyme into the duodenum.

Question 3

What is the primary purpose of the 'retropulsion' phase in gastric motility?

Accepted Answer

To force most of the chyme backward into the stomach for further mixing.

Question 4

Which process is responsible for moving chyme from the fundus toward the pylorus, as depicted in the first panel of the image?

Accepted Answer

Propulsion via peristaltic waves

Question 5

If the pyloric valve failed to close properly during digestion, which of the following would most likely occur?

Accepted Answer

Large amounts of undigested food would enter the duodenum, potentially overwhelming its capacity.

Question 6

Which of the following best explains why only small amounts of chyme are delivered to the duodenum at a time?

Accepted Answer

To prevent the duodenum from becoming too acidic and overwhelmed by hypertonic chyme.

Question 7

During which phase of gastric motility does the pyloric valve act as a pump, delivering small amounts of chyme into the duodenum?

Accepted Answer

Grinding

Question 8

Which of the following statements about gastric motility is correct?

Accepted Answer

Retropulsion helps mix chyme and ensures only small amounts enter the duodenum.

Question 9

If a patient has a malfunctioning pyloric valve that remains closed, what is the most likely consequence?

Accepted Answer

Delayed gastric emptying, leading to gastric distension and possible vomiting.

Question 10

Which of the following best describes the sequence of events during gastric motility as shown in the image?

Accepted Answer

Propulsion → Grinding → Retropulsion

The Stomach: Anatomy, Physiology, and Regulation

Study Guide - Practice Questions