1) air containing oxygen enters the lungs and passes into each alveolus from outside
2) de-oxygenated blood containing carbon dioxide comes from the rest of the body
- oxygen is diffused into the blood from the alvoli
- carbon dioxide from the blood into the alveoli
- the blood becomes oxygenated
3) air containing more carbon dioxide leaves the lungs
4) the oxygenated blood leaves the lungs and is transported by the circularatory system for use throughout the body.
(oxygen coming in---------> carbon dioxide going out)
-oxygen comes in through the nasal passages and into the red blood cells then carbon dioxide escapes and you breath it out.
2) de-oxygenated blood containing carbon dioxide comes from the rest of the body
- oxygen is diffused into the blood from the alvoli
- carbon dioxide from the blood into the alveoli
- the blood becomes oxygenated
3) air containing more carbon dioxide leaves the lungs
4) the oxygenated blood leaves the lungs and is transported by the circularatory system for use throughout the body.
(oxygen coming in---------> carbon dioxide going out)
-oxygen comes in through the nasal passages and into the red blood cells then carbon dioxide escapes and you breath it out.