Salivary amylase begins the digestion of
Correct answer: B. starch
- A. protein
- B. starch
- C. fat
- D. cellulose
Explanation
Salivary amylase hydrolyses starch to the disaccharide maltose, so carbohydrate digestion is the only kind that starts in the mouth. It works best near neutral pH and is destroyed once the food reaches the acid of the stomach, which is why chewing time matters. Humans secrete no cellulase at all, so cellulose passes through as roughage.
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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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