Heart

• The right atrium receives deoxygenated blood from the body through the superior vena cava and inferior vena cava
• The heart is located between the lungs, behind the sternum (breastbone), and to the left side of the chest.
• The left ventricle pumps oxygen-rich blood to the rest of the body via the aorta
• The heart is divided into four chambers, two on the right side (right atrium and right ventricle) and two on the left side (left atrium and left ventricle)
• Blood flows between these chambers through valves that prevent backflow.
• Blood flows into the right atrium from veins that carry oxygen-poor blood from all parts of the body except the lungs.
• The heart's outer layer is called the pericardium
• The tricuspid valve separates the right atrium from the right ventricle.
• The bicuspid or mitral valve separates the left atrium from the left ventricle.
• When the right ventricle contracts, blood is pumped out of the heart through the pulmonary semilunar valve into the pulmonary trunk, which divides into the right and left pulmonary arteries.
• The pulmonary semilunar valve prevents backflow of blood from the pulmonary artery into the right ventricle.
• The heart has four chambers - two atria and two ventricles
• Blood then passes through the tricuspid valve into the right ventricle.
• The aortic semilunar valve lies between the left ventricle and the aorta.
• The pulmonary semilunar valve lies between the right ventricle and the pulmonary artery.
• heart diagram