Important Facts About the Human BodyShare:FacebookPinterestTwitterMailThe human brain functions on ____ watts of energy.73%Next Correct Incorrect The brain uses 45-67 watts of power, roughly equivalent to running a small LED light. Despite this, the brain is composed of 80% water. The human brain functions on ____ watts of energy. 500 Watts 45-67 Watts 12-25 Watts 45-98 Watts 73%