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Question
Astronauts in zero gravity are able to move food through their digestive tracts because __________.
A. smooth muscle produces waves of contractions that propel material through the digestive tract
B. skeletal muscle puts pressure on the digestive tract
C. cardiac muscle maintains a high pressure that moves material through the digestive tract
D. striated muscle creates a pressure gradient that forces material from one end of the digestive tract to the other
E. skeletal muscle sphincters contract and allow materials to move through the digestive tract
Answer
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Related questions
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