During swallowing food is prevented from being pushed up into the nasal cavity by:

Correct Answer: C

Rationale: The soft palate elevates during swallowing to close off the nasopharynx, preventing food from entering the nasal cavity. The epiglottis prevents entry into the trachea.

Correct Answer: B

Rationale: Meissner's plexus is located in the submucosa and regulates glandular secretion and local blood flow.

Correct Answer: B

Rationale: During active HCl secretion, parietal cells' intracellular canaliculi expand with numerous microvilli, and the tubulovesicular system decreases as it fuses with the canaliculi.

Correct Answer: C

Rationale: Zymogen (chief) cells are located in the body and base of fundic glands, not the neck, and secrete pepsinogen and gastric lipase.

Correct Answer: C

Rationale: Striated ducts are found in salivary glands, not the exocrine pancreas, which has intercalated ducts instead.