Which process matches the definition: Rhythmic contraction and relaxation of smooth muscle that propel food along the digestive tract?

Correct Answer: B

Rationale: Peristalsis is the rhythmic muscular action that moves food through the digestive tract.

Correct Answer: C

Rationale: The vermilion zone's epithelium is thinner than the outer labial skin, not thicker, allowing the underlying vascularity to show through, giving it a red appearance.

Correct Answer: A

Rationale: Foliate papillae are located on the posterolateral sides of the tongue, not the tip, and are rudimentary in humans but prominent in rabbits.

Correct Answer: C

Rationale: The muscularis externa of the esophagus transitions from skeletal muscle (upper third) to smooth muscle (lower third), not entirely smooth muscle.

Correct Answer: C

Rationale: Intracellular canaliculi are not continuous with rER; they are specialized for ion transport and expand with microvilli during secretion.