WHAT HELPS IN THE EXCHANGE OF RESPIRATORY GASES.
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Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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The walls of the alveoli share a membrane with the capillaries. This lets oxygen and carbon dioxide move freely, between the respiratory system and the bloodstream.
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