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BIOLOGY
Respiratory System
Internal Resp. Gas Exchange
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jared pahilga
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Gas exchange in the alveoli
1. Diffusion of
carbon dioxide
out of blood
2. Diffusion of
oxygen
into blood
Gas exchange in the alveoli takes place through the process of
diffusion
Material moves from an area of
higher
concentration to an area of
lower
concentration
Blood that goes to the alveoli through the capillaries is poor in
oxygen
and rich in
carbon dioxide
Carbon dioxide in the blood
Diffuses
out of the blood into the alveoli
This gas is released out of the body when you
exhale
Oxygen from the inhaled air inside the alveoli
Diffuses
into the blood
The blood, which is now
rich
in oxygen and
poor
in carbon dioxide, leaves the alveoli
The blood flows back into the
heart
which pumps the blood to be delivered to different parts of the body