What is the primary function of the gastric folds, also known as rugae?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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What is the primary function of the gastric folds, also known as rugae?  
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Hint 1. Function of Rugaeopened hint
Rugae are much less conspicuous after consumption of a meal. What might this fact indicate about their function?  
 
What is the primary function of the gastric folds, also known as rugae?
to allow the lumen of the stomach to expand
to produce friction and slow the release of chyme from the stomach
to produce hydrochloric acid and pepsin
to increase the surface area available for absorption
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