(For Physiology 435)
Our noses have several important duties
In addition to making some people cuties.
They smell what comes near our faces
And funnel air quickly through small spaces
The airway has branches like a tree
That end in millions of alveoli.
That tree's encased in a wet double sack.
We will our muscles to pull the sack back
So air rushes in and happens to meet
Blood flowing near by that's in dire need.
Hemoglobin hands off CO2 to the air
And grabs all the O2 it can possibly bear.
Apr. 22, 2012
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