Esophagus, all true except:

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: 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.

Correct Answer: D

Rationale: The pyloric region primarily functions as a regulator of food movement into the small intestine, not as a major site for nutrient absorption.

Correct Answer: B

Rationale: The stomach's pH is approximately 1.8 due to the secretion of hydrochloric acid, creating an acidic environment for digestion.