Digestion takes place in a long tube-like canal called the alimentary canal, or the digestive tract. Food travels through these organs in the following order:

Correct Answer: A

Rationale: The correct digestive order is mouth, gullet (esophagus), stomach, small intestine, large intestine, rectum, making A correct. B reverses small/large intestine, C misplaces esophagus, and D misorders stomach and gullet.

Correct Answer: D

Rationale: Gastric secretions include pepsin, which breaks proteins into peptides, making D correct.

Correct Answer: C

Rationale: Pepsin digests proteins in the stomach, making C correct.

Correct Answer: C

Rationale: Mitochondria provide energy for active glucose absorption, making C correct.

Correct Answer: D

Rationale: Peristalsis is the rhythmic contraction moving food through the esophagus, making D correct.