The human respiratory system breathes atmosphere into the lungs. The concentration of oxygen in the atmosphere is higher than th
at of blood. The oxygen therefore flows into the bloodstream down its concentration gradient through the cell membranes of the lung cells and blood cells. This process is defined as
simple diffusion is responsible for exchange of gases between alveoli and blood. oxygen flows from alveoli to blood and CO₂ flows from blood to alveoli on the principle of simple diffusion
All of the cells in an organisms have the same genetic information. Your skin cells has the same exact DNA as every other cell in the organism.<span />