Have you ever seen a doctor shock a person’s heart when the heart is dead in movies or tv shows? Why do they do that, and how does it make the heart start beating again? In this speech we are going to talk about that. Good morning judges, teachers, parents and students, today I will be telling you all about the heart, it’s different parts, how it works, and how to keep it healthy.
The heart has an electrical part that makes the muscle act like a pump. The electrical part starts with the SA node, which makes a spark every second or so that starts every heartbeat. The electricity goes down the AV node to control its speed and then a system of wires called the His bundle, that make the ventricles contract, which is called systole. In between electrical sparks, the ventricles relax and are filled with blood from the left and right atrium, called Diastole.
During systole the right ventricle does not pump blood to the right atrium because of the tricuspid valve. Instead the right ventricle pumps it forward to the pulmonary artery to get oxygen from the lungs. During diastole, the right ventricle does not suck blood back from the pulmonary artery because the pulmonary valve is blocking it. Instead blood flows from the right atrium to the right ventricle. The exact same thing happens on the left side. The mitral valve prevents blood going backwards during systole and the aortic valve prevents blood going backwards in diastole. The “lub-dub” sound of the heart is actually the valves opening and closing. The coronary arteries give blood to the heart so it can function.
How to keep a heart healthy is to eat vegetables and fruet and to run, jump, and stay fit. Fatty foods can clog the coronary arteries and cause heart attacks. Some illegal drugs are very bad for the heart because they make the heart beat too fast and make the coronary arteries tighten. Diabetes is also bad for the heart. People can prevent diabetes by avoiding candy and sugary food. Smoking is one of the worst things for the heart. It can cause the coronary arteries to block, resulting in a heart attack.
Sometimes after a heart attack, the electrical system stops working. If it happens in a hospital, doctors can shock the heart with a defibrilator to restart it. If it happens at a school, well most schools actually have a defibrilator. Do we?