An increase in the hemoglobin concentration of the red blood cells would increase the rate of oxygen diffusing from lung alveoli into the blood.
The capillaries (small blood vessels) lining the alveolar walls allow oxygen to diffuse from the alveoli to the blood throughout this process.
Hemoglobin in red blood cells absorbs oxygen as it enters the bloodstream.
Then, as the blood returns to the heart, the heart sends the oxygen-rich blood through the arteries to the body's tissues.
The alveoli are where blood is infused with oxygen (air sacs).
Small blood arteries called capillaries are located quite close to the alveoli.
Oxygen and carbon dioxide travel along the concentration gradient due to the alveolar and capillary walls' extreme thinness.
This motion is referred to as diffusion and an increase in the hemoglobin concentration of the red blood cells would increase the rate of oxygen diffusing from lung alveoli into the blood.
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