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Exercise causes hypoxia, which increases the demand on the heart to supply all the vital organs with oxygen. Therefore, being a secondary property the GI Tract has blood flow reduced.

I don't know if that's what you're looking for, you might want to search something more relevant to the whole body rather then a system. For example "effects of exercise on the human body."

Exercise is sympathetic so decreases peristalsis and makes vasoconstriction to blood vessel.

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11y ago
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Q: What happens to the gastrointestinal tract during exercise?
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