Discuss mechanisms of absorption.

Explanation

### Step-by-Step Text Solution for the Mechanisms of Absorption

1. **Introduction to Absorption Mechanisms**:
Absorption is a crucial process in digestion where nutrients from digested food are taken up into the bloodstream. Different molecules utilize various mechanisms for absorption.

2. **Simple Diffusion**:
- **Definition**: Simple diffusion is a passive transport mechanism where substances move across cell membranes without the need for energy.
- **Examples**: Small amounts of monosaccharides (like glucose), amino acids, and some electrolytes (such as chloride ions) are absorbed through simple diffusion.
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