Question

Which best describes the physical and chemical digestion of food?

Physical and chemical digestion occur in the mouth; only chemical digestion occurs in the small intestine.
Physical and chemicall digestion occur in the small intestine; only chemical digestion occurs in the mouth.
Only physical digestion occurs in the stomach; chemical and physical digestion occur in the large intestine.

Answer 1

The first statement is the best choice.

Explanation: Digestion in the mouth is both physical (chewing) and chemical (salivary amylase). The small intestine is the main site of chemical digestion (pancreatic enzymes, brush-border enzymes, bile) and absorption, though it also has mechanical mixing (segmentation and peristalsis). The other two statements are incorrect about where chemical and physical digestion occur.