There are many answers but I would say because it supplies blood and oxygen to our entire body and make other vital organs functional such as the brain. In short, without the heart we would have no blood flow, and without bloodflow we could not survive.
it could be lots of things but the most important is your heart
heart because if heart is not present in body brain do not get blood and so brain will damage
heart because if heart is not present in body brain will not get blood and if brain will not get blood it will damage
The heart is the most important muscle of the body because it is the organ that pumps the blood throughout the body to carry out oxygen and nutrients, and helps collect and eliminate carbon dioxide and other wastes from the body.
Brain is supposed to be the most 'privileged' organ. Others may say that your heart is the most 'privileged' organ. As such all body organs are very important. You know there importance, once they do not function.
Heart
Your Heart. It is the most obvious organ. It pumps blood to the rest of your body allowing it to function. Someone with a weak heart would not be able to participate in activities such as rock climbing because of the risk of heart attack.
The brain is the most important organ in the body as there is no device/implant that can replicate the tasks it performs. There is no way as of yet to even successfully transplant a brain The heart and lungs are also vital, if they don't work you die in minutes. Many other organs are also vital, for instance the liver and kidneys. We are complex organisms and all our body parts work together to keep us functioning.
your heart the most major organ
probably the heart because the heart generates about most the body heat. does that answer your question?
The heart is a muscle and in fact the most important
The egyptians thought the heart was used for thinking and was the most important organ in the body. It was the only organ which was not removed from mummies. They did not know what the brain was for. They thought it was useless, so it was taken away from mummies. They thought that only the heart was necesary for the afterlife.