Peristalsis is
Correct answer: A. a wave of contraction of circular muscle behind the food that pushes it along the gut
- A. a wave of contraction of circular muscle behind the food that pushes it along the gut
- B. the churning of food by the teeth
- C. the return of food from the stomach to the mouth
- D. the absorption of nutrients into the blood
Explanation
Circular muscle contracts behind the bolus and longitudinal muscle contracts in front of it, so a wave of narrowing travels along the tube and moves the contents in one direction. Because the muscle does the work, food reaches the stomach even when a person is lying down or standing on their head. The same mechanism moves material through the whole alimentary canal.
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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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