Answer:
fear is a emotion which is a very weak point of a human as many of the people have fear with something whether it's a height , insects or anything , and it is a weak point as anyone can use your fear to make you weak and hurt you or someone can also help you to overcome from it ,our brain function it by sending are messages to our body from our senceing places like eye ,and there are billion of nerves in our brain which help us to feel and send our messages to our body parts
( I think it would help you a little... sky)