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respiratory system

an unfit athlete...
has a high respiratory rate.
a fit athlete...
has a low respiratory rate.
what is the main role of the respiratory system?
supplies oxygen to the body.
why does the body need oxygen?
to give the muscles energy to move.
what is the job of the trachea?
to direct oxygen into the lungs and direct carbondioxide out of the body.
what is the job of the alveoli?
to transfer the oxygen to the blood.
what is the job of the bronchi?
to channel oxygen to the alveoli.
what is the job of the lung?
contains the bronchi and alveoli inside it.