MRCS: Physiology MCQs 1

Gastrointestinal System

1. All the following factors delay gastric emptying EXCEPT:

a) increased gastric volume
b) hypertonic chyme
c) cholecystokinin (CCK)
d) gastric inhibitory peptide (GIP)
e) proteins and amino acids

Answers

1. a. Increased gastric volume leads to more rapid emptying. CCK and GIP are released by the small intestine in response to foods; they increase contractility of the pyloric sphincter. Hypertonic chyme delays gastric emptying. Proteins and amino acids stimulate gastrin release which, in turn, increases contractility of the pyloric sphincter.

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