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The heart has four chambers or closed spaces.some animals have only two or three chambers.In humans, the four chambers are two atria and two ventricles. Atria is talking about two chambers; atrium is talking about one chamber. There is a right atrium and right ventricle. These get blood that comes to the heart. They pump this blood to the lungs. In the lungs blood picks up oxygen and drops carbon dioxide. Blood from the lungs goes to the left atrium and ventricle. The left atrium and ventricle send the blood out to the body. The left ventricle works six times harder than the right ventricle because it carries oxygenated blood..[1] Blood is carried in blood vessels. These are arteries and veins. Blood going to the heart is carried in veins. Blood going away from the heart is carried in arteries. The main artery going out of the right ventricle is the pulmonary artery. (Pulmonary means about lungs.) The main artery going out of the left ventricle is the aorta. The veins going into the right atrium are the superior vena cava and inferior vena cava. These bring blood from the body to the right heart. The veins going into the left atrium are the pulmonary veins. These bring blood from the lungs to the left heart. When the blood goes from the atria to the ventricles it goes through heart valves. When blood goes out of the ventricles it goes through valves. The valves make sure that blood only goes one way in or out. The four valves of the heart are: Atria to ventricle valves Tricuspid valve – blood goes from right atrium to right ventricleMitral valve – blood goes from left atrium to left ventricleVentricles to arteries Pulmonic valve – blood goes out of the right ventricle to the lungs (through the pulmonic artery)Aortic valve – blood goes out of the left ventricle to the body (through the aorta)The heart has three layers. The outer covering is the pericardium. This is a tough sack that surrounds the heart. The middle layer is the myocardium. This is the heart muscle. The inner layer is the endocardium. This is the thin smooth lining of the chambers of the heart.[2]
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