The main function of the kidney is to ____ the blood. Our blood cycles through our kidneys up to ____ times a day. Special structures in the kidney, called ____ are responsible for removing toxins, drugs (medicines we take), and ____ from our ____. The nephrons also make sure that our blood retains important molecules such as glucose and water. The kidneys contribute to our health by removing wastes and by maintaining a balance of ____, salts, and minerals in our blood.

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