Most people have two kidneys, each about the size of a fist, located on either side of the spine at the lowest level of the rib cage. Each kidney contains up to a million functioning units called nephrons.
The kidneys are very crucial organs that perform a number of important functions in the body which include:
Cleaning the blood by removing waste products
Regulating the fluid balance of the body
Regulation of the chemical balance in the body, for example, sodium, potassium, acid and base balance, etc
Regulation of the calcium, phosphorus and Vitamin D metabolism and hence bone health in the body
Regulation of blood pressure
Make hormones that stimulate the bone marrow to make red blood cells