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              Description: Your heart is about the size of your fist. It is shaped like an upside-down pear. The heart is a muscle; it acts like a small pump. This pump is divided into four cavities, two of them are called atria and the other two are called ventricles. The left side of the heart houses one atrium and one ventricle. The right is the same. The smooth inside lining of the heart is the endocardium. The middle of the heart is called myocardium. And the fluid filled sac that surrounds the myocardium is the pericardium.
              Location: If you were to take your fist and put it in the middle of your chest that would be about where you heart is located.
              How it Works: All blood enters the heart through the right side of the heart. And is collected in the right atrium. When the right atrium contracts the blood flows through the tricuspid valve into the right ventricle. From there the right ventricle contracts pushing the blood out of the heart and to the lungs to pick up oxygen. The blood then goes into the left atrium. Then from there the left atrium contracts sending the blood through the mitral valve and into the left ventricle. This is the strongest muscle in your heart, because it has to pump all your blood all the way around your body and back up to your heart! Where it will start the cycle over again.
              Diseases: In 1997 heart disease was the leading cause of death for Americans. Nearly 31% of all deaths were caused by heart diseases.
             • Coronary Heart Disease: It is the most common heart disease in the US today. It starts out by a fat build up in the vein. Then it will suddenly rupture causing a scab to form, which will block all blood from getting through the vein. Which will cause the person to have a heart attack.
             • Arrhythmia: Arrhythmia is any type of irregular heart beat. Sometimes the heart will skip a beat, or it might be a continuous slow or fast heart rate.

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