Valves to control the movement of food in and out of the stomach are called
a. reflux regulators.
b. peristalsis muscles.
c. sphincter muscles.
d. segmentation muscles.
C
Sphincter muscles control the movement of food in and out of the stomach. They do help prevent reflux, but this is not their name. They are not involved in peristalsis. Segmentation occurs as circular and longitudinal muscles cause food to move backwards and forwards in the gut.
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