What is the connection between the 'Heart' and 'Brain'?

There is a huge conversation on Love between the two friends.

One friend ask like this. What is the connection between the 'Heart' and 'Brain'? Does the heart have any feelings? In my opinion, Heart is a dumb machine which roars with the two sounds Lub-Dub. But I still donno how this dumb machine became an important thing in the every aspects of love for writers.

Then after a long thought he continued like this....

While creating the man, God has posing attributes to each part of the body. And he is connecting every part to come under the brain control. But he waited while adding the attributes to the Heart. He has given some special qualities for the heart. "The only function which cannot control by the brain all the times". But the other parts should function under the commands of brain. Like, in coma, some of the parts may wont receive the commands from the brain. And it not all function. But Heart never comes under the brain.
                  Even the heart attack is due to blocking the blood vessels but not due to brain. It's all indirect way.

Then what is the reason for appending the Love to heart?

Hmmm.... okie. Let assume, you are walking alone in the midnight and all of sudden, some one hold you back. You just stuck. Then what are the changes you observe in your body? The sweating comes on my body, the heart beat rate increase than normal. Okie. Suppose, when your lover give a hand to you. And you are in huge pain. Then what is your reaction? Yeah. The eyes fill with tears. The heart functioning is almost negligible to me. 

So, in every happy or pain, who comes in the scene, the "Heart". Even though the feelings are created in the brain, the reaction happens in the Heart.

So, whom I have to consider Hero for the drama. Obviously it is "Heart". The feelings are created in the brain, but the heart takes away the prestige.