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14:57
Khan Academy
Sal Khan
Khan Academy
Hemoglobin, found in red blood cells, absorbs oxygen, increasing the diffusion gradient. This process encourages oxygen to cross the membrane. Hemoglobin is contained within red blood cells to prevent blood from becoming too thick. The blood flows from the heart to the lungs via the pulmonary artery, gets oxygenated, and returns to the heart ...
Feb 20, 2011
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