The blood vessels that are intimately associated with alveoli in the lungs are part of the capillaries of the circulatory system.
- The pulmonary artery brings the deoxygenated blood into the lungs for purification and it breaks down into small capillaries near the alveoli.
- Carbon dioxide from the deoxygenated blood moves into the alveoli and oxygen from the alveoli passes into the capillaries through diffusion.
- The capillaries then open into the pulmonary veins which carry the oxygenated blood.
Thus, the blood vessels that are intimately associated with alveoli in the lungs are part of the capillaries of the circulatory system.
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