This is a muscular sac that stores urine.

This is the main gas that is excreted from the lungs after breathing oxygen.

This part of the excretory system filters the blood and creates urine.

The kidneys monitor what in the blood stream?

This is the tube that passes urine out of the body.

The urine comes out of the _____.

This is the tube that delivers urine from the kidney to the bladder.

This makes up 2.3% of urine and is a dissolved solid.

This is a tiny filtering system inside the kidneys that removes wastes from the blood.

If the body didn't have the excretory system it would collect harmful levels of ____.