Answer :
Ear specifically inner ear
Our ear has three parts. Outer, middle and inner ear. Inner ear helps us maintain the body balance by the help of semi circular canals it contains. There are 3 semi circular canals there placed at right angle to each other. These contain fluid and with sensing the movement of that fluid during our movement of head on both sides of the head (we have 2 ears), these help to maintain balance of our body.