internal features of the heart

• th heart is divided into 4 chambers, the 2 atria and 2 ventricles., these receive blood from the major veins. the deoxygenated blood from the body flows through the vena cava into the right atrium. oxygenated blood flows through the pulmonary vein into the left atrium
• from the atria, blood flows down the atrioventricular valves into the ventricles. Attached to the valves are the obvious tendinous cords which prevent the valves from turning inside out when ventricle walls contract. a wall of muscle called the septum separates the ventricles from each other, this ensures that the oxygenated blood of the left side of the heart and the deoxygenated from the right side of the heart do not mix and are kept separate.
• deoxygenated blood leaving the right ventricle flows into the pulmonary artery leading to the lungs. oxygenated blood leaving the left ventricle flows into the aorta.