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or
oxygenated air is brought before
Respiration begins at
the
moving down
and, the,
trachea branches into two
_. The
each leading into a lung.
Each bronchus divides into smaller bronchi, and again into even smaller
At the end of the bronchioles
are air
and this is where gas exchange occurs.
tubes called
sacs called
An important structure of respiration is the
the diaphragm contracts, it
When
and the lungs
drawing air into the lungs. When it relaxes, air flows
out, allowing the lungs to
TCL