The earthworms nephridia filter out wastes which human organs have a similar function

Kidneys

Explanation:

The kidneys are two organs about the size of a bean-shaped fist. In an amount of 2 (two), they are located immediately below the rib cage, one on each side of the spine. Each day, the two kidneys filter about 120 to 150 liters of blood to produce about 1 to 2 liters of urine, the primary function of these organs is to filter waste from the body, similar to what worm nephrids do.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.