For me, the most important part of the body is the brain, because it is like tho motor of the body, it gives all the instructions to our body so it can work very well and it the responsible of our feeling, emotions, movements and all our vital functions. 

• It's very powerful.
• It's incredible how it works. 

I think the most important part of the body is the brain because it controls everything we do.

I think the brain is the most important part of the body because it controls our thoughts, actions, and all other organs.

For me, the heart and the brain are the most important parts of the body, because the brain gives us thoughts and actions, and the heart gives us life. The heart also sends blood to the brain so it can do all of that.