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(not 100% sure about this). =========================================================. Capillaries, rather, have to be thin otherwise gas exchange (oxygen from the lung's alveoli, and carbon dioxide from the capillaries), could not take place.Also, down-loading of nutrients and other necessary substances, etc., needs thin capillary walls as well.   Capillaries are one cell thin so that the red blood cells can easily exchange oxygen that they picked up in the lungs, with the bodies cells.
Rating Newest Oldest. Best Answer: This layer is so thin that molecules such as oxygen, water and lipids can pass through them by diffusion and enter the tissues. Waste products such as carbon dioxide and urea can diffuse back into the blood to be carried away for removal from the body. Capillaries are so small the red blood cells need to partially fold into bullet-like shapes in order to pass through them in single file. Source(s): http://en.wikipedia.org/wiki/Capillary.