Why Does Oxygen Move from the Alveoli into the Pulmonary Capillary Blood?

Answer

Oxygen moves from the alveoli into the pulmonary capillary blood for exchange of gases between the lungs and blood. The gases need only diffuse through a single squamous epithelial cell of an alveolus and the single endothelial cell of the capillary to reach the blood cell inside the capillary. This action is known as diffusion.
Q&A Related to "Why Does Oxygen Move from the Alveoli into the..."
Oxygen diffuses from the alveoli into the blood due to higher PO2 (partial pressure of oxygen) levels in the alveoli than in the blood.
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To balance out the gases and deliver oxygen
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Because it's more concentrated in the alveoli; that's called "diffusion.
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The biggest driver of gas exchange in the alveolar-capillary membrane is diffusion; there is a pressure gradient between the alveolar oxygen and mixed venous oxygen. The blood flowing
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