The Movement of Nutrients from the Digestive Tract Lumen Across

Question

The movement of nutrients from the digestive tract lumen across the epithelium is called
A) chemical digestion.
B) absorption.
C) secretion.
D) reabsorption.
E) ingestion.

Accepted Answer

Absorption refers to the movement of nutrients from the digestive tract lumen across the epithelium and into the bloodstream or lymphatic system. Chemical digestion refers to the breakdown of food molecules into smaller units by enzymes. Secretion refers to the release of substances such as enzymes or mucus into the digestive tract. Reabsorption refers to the movement of molecules or ions from the filtrate in the kidney tubules back into the bloodstream. Ingestion refers to the process of taking in food.