Maps

A doctor may give you advice
Which may  uncomprehendingly  be taken  in  twice.
The first time ‘s the best
And afterwards  rest
Then admire her for she is most wise.

A diagram is useful in maths;
Or in comprehending the Underground maps.
But the world is far more
Than these lines can show.
I should mention we never show traps

The diaphragm is a muscle I think,
That makes us  each breath and then wink
It divides thorax and abdomen
In ladies and gentlemen;
Inside, both the sexes are pink