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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.
Report Abuse. Exchange vessels include capillaries and postcapillary venules. The walls of capillaries are composed of only a tunica intima (a thin layer of endothelial cells). The average diameter of the lumen is just large enough to allow erythrocytes (red blood cells) to pass through in single file.Exchange vessels are the site where gases, nutrients, and wastes are exchanged between blood and surrounding tissues.There are three major type of capillaries: continuous, fenestrated, and discontinuous.xchange vessels are the site where gases, nutrients, and wastes are exchanged between blood and surrounding tissues. There are three major type of capillaries: continuous, fenestrated, and discontinuous.