CAS BI 211 Lecture Notes - Lecture 6: Heart Valve, Pulmonary Valve, Aortic Valve
Document Summary
Right ventricle pulmonary valve pulmonary veins. Joined to neighbors by intercaltated discs made up of gap junctions and desmosomes. Blood flow: flow of blood is accomplished by contraction of each chamber of the heart, atrial contractions occur together and move blood to ventricles, ventricular contractions occur together and move blood to lungs and body. Important components: one way flow, controlled by electrical signals (action potentials) Heart: sinoatrial node (upper right atrium) pace maker; highest concentration of funny channels, rest of nodes have less concentration of funny channels, atrioventricular node , atria contract; then ventricles contract, signal passes from atria to ventricles. Intermodal pathway: sinoatrial node, right branch of bundle of his, atrioventricula node. Left branch of bunch of his: purkinje fibers. If sa node is damaged, the av node will assume pacemaker control but the resting heart rate will be much lower: bradycardia, pacemaker implants. Heart attack: heart attack damages muscle wall, heart block blocks signaling through the wall.
