Thoughts on Four of the Organs

Can you explain the function of the spleen?
That bit of knowledge I would like to glean.
Is it brown or blue or neon green?
Please describe what the word really means
and reveal to me the workings of the spleen.

The liver - that I know a lot about,
its function clearly known without a doubt.
If and when alcohol you drink
and maybe even if you drink ink
the liver will surely push those toxins out.

Lo - the appendix,
which among the organs sticks
out like a penguin in a crowd of grizzly bears.
Its awkwardness exists because
no one really knows what it does,
but, frankly, I don't think anyone really cares.

Let us not forget the heart,
understood to be the most integral part
of the crucial cardiovascular system.
It pumps the blood which carries life
(the loss of which is cause of strife).
The Egyptians thought their thoughts were hosted in them.

Ah, the Poetics.