The pH in the mouth decreases after eating. Which statement explains the decrease in pH?

Correct Answer: A

Rationale: Bacterial metabolism of food releases acids, lowering the pH in the mouth.

Correct Answer: A

Rationale: The liver consists of lobules, functional units where hepatocytes radiate from a central vein, facilitating its metabolic roles.

Correct Answer: B

Rationale: Peristalsis involves coordinated muscle contractions to push food forward.

Correct Answer: B

Rationale: The superior surface of the soft palate is covered by pseudostratified ciliated columnar epithelium (respiratory epithelium), not stratified columnar, due to its proximity to the nasopharynx.

Correct Answer: C

Rationale: Filiform papillae are the most numerous type on the tongue, not less numerous than fungiform papillae, and they lack taste buds.