Structure & Function Heart

Structure of Heart

Heart Chambers Top Chambers are the left and right atrium Bottom Chambers are the left and right ventricles ~ atrium walls are thin because only needed to pump blood to bottom chambers

Structure & Function of the Heart Right Side ~ receives deoxygenated blood from body ~ this side pumps this blood to the lungs through the pulmonary arteries ~ pulmonary arteries are the only arteries in body that contain blood that is low in oxygen Left Side ~ receives oxygenated blood from the lungs ~ blood returns to heart from the lungs through the pulmonary veins ~ pulmonary veins are the only veins in body that contain blood high in oxygen ~this side pumps blood through left atrium & left ventrical to the body via the aorta

Superior Vena Cava~ large blood vessel that returns blood from the head, neck, and arms to the heart. Inferior Vena Cava~ blood from lower body flows through this vessel to the heart Pulmonary Artery-blood flows through this vessel from the heart to the lungs Pulmonary Veins-blood flows through this vessel from lungs back to heart Aorta~ The largest artery in the body, blood flows through this vessel to rest of body

Heart Valves A system of valves prevent blood from moving backwards through the heart Atrioventricular valves (AV valve) separate the atrium and ventrical Semilunar valves (SL valve) separate ventricles from pulmonary artery and aorta Semilunar Valve (Pulmonary Valve) Semilunar Valve (Aortic Valve) Atrioventricular Valve (Bicuspid Valve) Atrioventricular Valve (Tricuspid Valve)

The Heartbeat -SA node also known as a pacemaker

Heart Sound Heart sounds caused by the closing of the valves Creates “lub-dub” sound! ”lub” closing of AV valve ”dub” closing of SL valve Semilunar Valve (Pulmonary Valve) Semilunar Valve (Aortic Valve) Atrioventricular Valve (Bicuspid Valve) Atrioventricular Valve (Tricuspid Valve)