Ok types of diffusion

There are several types of diffusion:

1. Simple Diffusion: This is the net movement of a substance from an area of high concentration to an area of low concentration, without the help of membrane proteins. Examples include the movement of oxygen and carbon dioxide across cell membranes.

2. Facilitated Diffusion: This type of diffusion involves the movement of substances across a cell membrane with the help of specific membrane transport proteins (channels or carriers). It still moves down the concentration gradient but requires protein assistance. Examples include the transport of glucose and amino acids into cells.

3. Osmosis: This is a special type of diffusion that refers specifically to the movement of water molecules across a selectively permeable membrane from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration).

4. Active Transport: While not strictly diffusion (as it moves substances against their concentration gradient), it's often discussed alongside it. It requires energy (usually ATP) and membrane proteins to move substances.