The most complex part of our human body is the brain. It is the center through which our body operates. It is connected to the rest of the body with the help of the nerves (for more details, see "Nervous System"). Even though, it is the most important organ in the body, very little is known about it. But we do know that without our brains, what we wouldn’t be able to do. Let’s see what happens when we remove the upper part of our brain – We’ll not be able to think We’ll not be able to feel touch We’ll not be able to see & hear We’ll not be able to move our limbs in the way we want What happens when we remove the middle part of the brain – We would not be able to co-ordinate our action We would have no control on our urine and stools We would not be able control our facial expressions (imagine you’ll not be able to smile when you want). And what happens when we remove the lower part of the brain – We would not be able to breath We would have no control over eating Our blood pressure would go haywire And we would not be able to live Thus, you have seen all that we cannot do without out brains.