= Passive transport
{wiki=Passive_transport}
Passive transport is a movement of ions and molecules across cell membranes without the need for energy input. This process relies on the natural concentration gradient, meaning substances move from areas of higher concentration to areas of lower concentration until equilibrium is achieved. There are several key types of passive transport: 1. **Diffusion**: The movement of small, nonpolar molecules (like oxygen and carbon dioxide) directly through the lipid bilayer of the cell membrane.
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