Given these sphincters:
1. external anal sphincte
2. ileocecal sphincter
3. lower esophageal (cardiac) sphincter
4. pyloric sphincter
Arrange them in the order in which food passes through them.
a. 1,3,2,4
b. 2,3,4,1
c. 2,1,3,4
d. 3,4,2,1
e. 4,2,1,3
Answer: D
Feedback : The sequence of sphincters that food passes through is: 3,4,2,1.