Which structure regulates the movement of food into the stomach, and which regulates the passage of food into the small intestine?
a. pyloric sphincter; anal sphincter
b. gastroesophageal sphincter; pyloric sphincter
c. epiglottis; pyloric sphincter
d. epiglottis; gastroesophageal sphincter
Answer: b. gastroesophageal sphincter; pyloric sphincter
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What are the three types of bone cells?
What will be an ideal response?