CIRCULATORY- EXCRETORY

-       - The nephron is a tiny filtering structure in the kidneys. Each of the kidneys contain more than a million tiny filtering nephrons that help clean the blood.

-       - The nephrons help remove excess water, waste and other substances from the blood. By the Glomerulus with is a tiny blood vessel that filters the blood.

-       - The Nephron returns substances like sodium, potassium or phosphorus when one of the substances run low in the body