Heart structure

• The wall of the left ventricle is much thicker than the wall of the right ventricle - it must generate more pressure for blood to travel to the rest of the body.
• The walls of the atria are thin, they only ned to push blood to the ventricles.
• Valves make sure the blood can only travel in one direction, preventing backflow.
• The walls of the heart are made of cardiac muscle, which can contract and relax continuously without becoming fatigued.
• Coronary arteries supply the blood to the heart itself. These carry blood to the capillaries that supply the heart muscle with oxygen and nutrients. Blood is returned to the right atrium via coronary veins.