The heart

• Blood flows into the right atrium via the superior and inferior venae cavae (large veins).
• The right ventricle pumps deoxygenated blood to the lungs.
• The right atrium receives deoxygenated blood from the vena cava.
• The left side of the heart receives oxygenated blood from the lungs through the pulmonary vein.
• The left ventricle pumps oxygen-rich blood to the body through arteries, while the right ventricle pumps deoxygenated blood to the lungs through pulmonary veins.
• The left atrium receives oxygen-rich blood from the pulmonary vein.
• The heart is divided into four chambers - two atria and two ventricles.
• The right atrium receives deoxygenated blood from the body's tissues through the superior and inferior vena cava.
• The right ventricle pumps this deoxygenated blood out of the heart to the lungs through the pulmonary trunk.
• The left ventricle is responsible for pumping oxygen-rich blood out of the heart to the rest of the body.
• The right ventricle is responsible for pumping deoxygenated blood out of the heart to the lungs.
• Valves prevent backflow of blood during contraction of the ventricles.
• The heart has an electrical conduction system that coordinates its contractions.
• Blood flows between the atria and ventricles via valves that prevent backflow.
• Valves are flaps of tissue that open and close during contractions of the heart.