Summary:
- The kidneys are a pair of bean-shaped organs just above the waist.
- They are important organs with many functions in the body.
- The function of the kidney is to filter blood and form urine.
- Urine is the liquid waste product of the body that is excreted by the urinary system.
- The kidneys control the amount of water, ions, and other substances in the blood by excreting more or less of them in urine.
- They also secrete hormones that help maintain homeostasis.