ANATOMY 1 Lecture Notes - Lecture 16: Heart Valve, Pulmonary Circulation, Atrioventricular Node
Document Summary
Right and left ventricles act as two separate pumps that simultaneously eject equal volumes of blood. Left ventricle pumps blood under high pressure over great distances to all other. Pumps blood under low pressure short distance to lungs. Pump blood under high pressure over greater distances parts of body. Left works hard to maintain same rate of blood flow. Muscular wall of l ventricle is much thicker than right. Perimeter of the lumen of the left ventricle is circular, right is crescent-shaped. Heart wall contains dense ct that forms the fibrous skeleton of the heart. These rings surround valves of the heart, fuse with each other, and merge w/ Prevents overstretching of the valves as blood passes. Serve as points of insertion for bundles of cardiac muscle fibers. Act as electrical insulators between atria and ventricles. Blood moves from atria to ventricles through open av valves when atrial pressure is higher than ventricular pressure.
