From which Exchange of gas happend through
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Gas exchange happens inside the air sacs.Gas exchange is he diffusion of gasses into and out of the body.When you inhale 300 million alveoli expands and fill with air oxygen diffuses from alveoli into blood and carbon dioxide diffuses from blood into alveoli. Diffusion is the movement of gas and liquid particles from higher concentration to lower concentration. Finally carbon dioxide exhaled out.
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