Many amino acids are absorbed by intestinal epithelial cells by __________.Multiple Choiceosmosisactive transportsimple diffusioncotransport

To answer the question regarding how many amino acids are absorbed by intestinal epithelial cells, let's analyze each of the given options.

1. Osmosis: This process involves the movement of water across a semipermeable membrane and is not involved in amino acid absorption.

2. Active Transport: This mechanism uses energy (typically from ATP) to move substances against their concentration gradient. Many amino acids are absorbed using this method, as they need to be transported into cells despite their concentration being higher inside compared to outside.

3. Simple Diffusion: This is a passive process where substances move from an area of higher concentration to an area of lower concentration. While some small molecules might use this method, amino acids generally do not as they are larger and need specific transport mechanisms.

4. Cotransport: This is a type of secondary active transport where one substance (e.g., sodium ions) moves down its concentration gradient to help another substance (e.g., amino acids) move against its gradient. Many amino acids do utilize this mechanism in conjunction with sodium ions.

Final Answer

The correct option is active transport.