The human body requires water and ions for nerve function, muscle function, growth, and repair. However, very high levels of sodium, potassium, or even water can be harmful to the body.

The kidneys ensure that your water and ion levels are maintained. How do the kidneys react if you drink too much or too little water?

In this lesson, you will explore the following questions:

• How do the kidneys contribute to homeostasis in terms of water and ions?
• How does the design of the kidney relate to dialysis technologies?