Excretory system

4 important questions on Excretory system

What do the renal arteries do?

they carry oxygenated blood to the kidneys.  It contains a lot of waste products from other organs

What is special about the medulla and the cortex?

the don't only remove waste products, but whatever is in excess such as waater and salts, and other harmful substanes as well.

How is the urine carried to the bladder?

by two tubes called the ureters.
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Through which tube does your urine pass when urinating?

urethra

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