Bchbasic
Arrange the main digestive events for starch in the correct order.
Answer
Salivary amylase begins starch digestion in the mouth., Starch digestion stops in the acidic stomach., Pancreatic alpha-amylase acts in the small intestine., Brush-border enzymes produce absorbable monosaccharides., Monosaccharides are absorbed into portal blood.
Explanation
### The order
1. Salivary amylase acts briefly while food is chewed.
2. The acidic stomach environment stops carbohydrate digestion by amylase.
3. Pancreatic alpha-amylase resumes starch digestion in the small intestine.
4. Brush-border enzymes hydrolyze remaining small carbohydrates to monosaccharides.
5. Monosaccharides cross the intestinal lining and enter portal blood.
### Terms
- **Brush border**: The enzyme-rich surface of small-intestinal cells.
- **Portal blood**: Blood that carries absorbed nutrients from the gut toward the liver.
### Remember
Mouth, stomach pause, intestinal digestion, then absorption.
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