Adenoids are enlarged:

Correct Answer: B

Rationale: Adenoids refer to the enlarged pharyngeal tonsil, located in the nasopharynx, which can obstruct breathing when hypertrophied.

Correct Answer: D

Rationale: The esophageal mucosa contains mucous glands in the submucosa, especially in the upper and lower regions, not none along its length.

Correct Answer: B

Rationale: Goblet cells are found in the intestines, not gastric glands, which contain parietal, chief, and argentaffin (enteroendocrine) cells.

Correct Answer: C

Rationale: Pyloric glands are not perpendicular but are coiled and branched, unlike the straighter fundic glands.

Correct Answer: B

Rationale: The parotid gland is purely serous, not mixed, secreting watery saliva rich in enzymes.