Gas exchange

• • There are three main gases in air that are taken in and removed from the body. These are oxygen, nitrogen and carbon dioxide.
• • Gas exchange is the ‘swapping’ of gasses - absorbing oxygen into the blood and removing carbon dioxide from the blood.
• • Diffusion moves oxygen out of the alveoli and into the blood.
• • Gas exchange is a process that involves the swapping of gases that occurs at exchange surfaces such as the alveoli found within your lungs.
• Alveoli are tiny air sacs in the lungs where gas is exchanged during breathing
• Alveoli have a very large surface area to enable more diffusion of oxygen into the blood from the alveoli, and more carbon dioxide out of the blood into the alveoli