Select the best options; The concentration of oxygen within capillaries is (greater than) (less than) the concentration of oxygen in the surrounding tissue fluid; therefore, oxygen diffuses (into) (out of) the ca
Select the best options;
The concentration of oxygen within capillaries is (greater than) (less than) the concentration of oxygen in the surrounding tissue fluid; therefore, oxygen diffuses (into) (out of) the capillaries.
The exchange of oxygen and carbon dioxide is made possible by the diffusion of gases between tissues and capillaries. Oxygen is absorbed by the blood in the capillaries and carbon dioxide is released from the blood into the tissues in the respiratory system. The walls of smallest blood vessels, called capillaries, are the sites of gas exchange. Thin walls of capillaries which are made up of a single layer of endothelial cells facilitates diffusion of gases.
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