Diffusion
Diffusion#
Diffusion is the net movement of .
Diffusion Definition#
Diffusion Definition
Diffusion is the net movement of molecules from a region of higher concentration to a region of lower concentration. It is a passive process, meaning that it does not require energy input. Diffusion occurs due to the random motion of molecules, and it is driven by the concentration gradient.
Examples of Diffusion
- The diffusion of oxygen into the lungs. Oxygen is present in the air at a higher concentration than it is in the blood. Therefore, oxygen diffuses from the air into the blood through the lungs.
- The diffusion of carbon dioxide out of the lungs. Carbon dioxide is present in the blood at a higher concentration than it is in the air. Therefore, carbon dioxide diffuses from the blood into the air through the lungs.
- The diffusion of water across a cell membrane. Water is present at a higher concentration outside of the cell than it is inside the cell. Therefore, water diffuses into the cell through the cell membrane.
- The diffusion of glucose into a cell. Glucose is present at a higher concentration outside of the cell than it is inside the cell. Therefore, glucose diffuses into the cell through the cell membrane.
Factors that Affect Diffusion
