The heart, one of the most important muscles in your body. Located in the middle of the lungs, slightly to the left of your breastbone, the heart may not be very big, but without it you can't live. The heart pumps blood throughout your body, and acts as a circulatory pump. Withotu your heart you can't live. This website will have a detailed analysis on the heart explaining what it does, how it works with your lungs and body, evaluate how pacemakers effect the heart and what they do, and finally we will speculate how people struggle with heart problems such as heart disease and heart attacks.