The heart is a part of your body that pumps blood around your body. This helps all of your other body parts like your brain function. The heart also regulates the Blood Pressure (BP). If the Blood Pressure is high, that means you are exercising a lot at the moment. If your Blood Pressure is low, that means your heart is relaxed at the moment. You can hear your heart with your own ears. Using a stethoscope (helps amplify or make heart sounds louder) gives you clearer sound. Your heart is the one that delivers blood (which has Oxygen!) to other parts of your body and helps them function.