Dissolved substances move into and out of your cells by diffusion across the cell membrane
these include sugars such as glucose, gases such as oxygen and carbon dioxide and waste producs such as urea from the breakdown of amino acids in your liver
the oxygen you need for respiration passes from the air in your lungs into your red blood cells through the cell membranes by diffusion
the diffusion of oxygen and carbon dioxide in opposite directsion in the lungs is known as gas exchange
idicidual cells may be adapted to make diffusion easier and more rapid. The most common adaption is to increase the surface area of the cell membrane
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