Here's my contribution.

From Great Ways to Learn Anatomy and Physiology by Charmaine McKissock (Palgrave Macmillan, 2009), a poem to “help you remember the function of the kidneys”:

         The Song of the Kidney Kids

Let’s sing of the Kidney Kids, Kevin and Kate,
Who both do a job anybody would hate.
They collect up used blood both by night and by day,
Which they filter to take the waste products away.

Salts, drugs, uric acid, creatine and urea
Are removed with some water to leave the blood clear.
Then the toxic substance into urine is made,
As frothy and yellow as fresh lemonade.

This is poured through ureters – there are two of those –
Into the bladder and out through a hose
That is called the urethra. Your blood is now clean:
No one would ever know where it had been.