Stomach is the main site for the digestion of -

Correct Answer: C

Rationale: The stomach primarily digests proteins via pepsin.

Correct Answer: D

Rationale: Humans have three pairs of major salivary glands: parotid, submandibular, and sublingual.

Correct Answer: D

Rationale: Carboxypeptidase is a zinc-dependent enzyme that breaks down proteins into amino acids.

Correct Answer: B

Rationale: Segmentation in the large intestine involves rhythmic contractions that mix contents, increasing contact time with the mucosa for water and electrolyte absorption.

Correct Answer: D

Rationale: Sequential firing of vagal nerves from the nucleus ambiguus coordinates esophageal peristalsis, moving food downward.