Who Am I's?

I squeeze the heart

And steal elasticity

From the veins and the arteries

I've got the blood and lymph

Capillaries

In my fearful grip

The cerebrospinal fluid?

That surely takes a hit

The sympathetic nervous system

Feels the whip

The glands have been ship-

-wrecked

I'm always trying to get

The digestive system is listing

The kidneys are listening

As the ravenous hounds

Of fear and lust

Turn their water to dust

If the life force was flowing freely,

Fully and completely

Throughout the whole body

What would it teach me?