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UB ANA 113 Lec 22
Heart II
| Question | Answer |
|---|---|
| Intrinsic regulating | contraction stimulated w/o nervous system |
| sinoatrial node (SA node) | "pace maker" In wall of right atria. Initiate heartbeat. Specialized conducting cells. 72 times/minute |
| Atrioventricular Node (AV Node) | In Right atria. Receive from SA node. Pass to AV bundle |
| Atrioventricular bundle of His (AV Bundle) | tract of conduction fibers within intervertebral septum. Passes message to purkinje fibers |
| Purkinje Fibers | In walls of ventricles. Conduct impulse to myocardium = Ventricular contraction |
| Extrinsic regulating | ANS stimulation |
| Sympathetic stimulation | increase rate and strength . release norepinephrine. Act on SA Node |
| Parasympathetic stimulation | decrease rate and strength, release acetylcholine. Inhibitory |
| cardiac cycle | complete heartbeat |
| Atria contract | AV valves open, blood rushes into ventricles |
| Systole | Ventricles contract, AV valves close, semilunar valves open, blood ejected out. Blood under highest pressure |
| Diastole | ventricles relax, semilar lunar valves close, AV valves open, Blood is in atria. Wait for SA node to fire to begin next cycle. Lowest pressure |
| Amount of blood pumped every minute | 5L |
| Austcultation | listening to body sounds. |
| 1st heart sound | lubb - AV valves close |
| 2nd heart sound | dupp - semilunar valves close |
| Auscultory areas | adjacent to anatomical location so sternum does not obscure the sound. Listen towards the flow of blood. |
| Aortic area | 2nd intercostal space on right side - aortic semilunar valve |
| Pulmonic area | 2nd intercostal space on left side. Pulmonic semilunar valve |
| Tricuspid area | 5th intercostal space right of sternum. Right AV Valve |
| Bicuspid area | 5th intercostal space left of sternum. Near apex. Mitral(left AV valve) |
| coronary circulation | supplies heart with blood, carries away waste ... first branches of aorta |
| right coronary artery | posterior interventricular. lateral right heart. In septum on posterior side of ventricles |
| left coronary artery | anterior interventricular. Interventricular septum(think bundle of His) & anterior walls of ventricles. Cirumflex supply left atrium and posterior left ventricle |
| Coronary sinus | blood drained from coronary veins into.. then into right atrium |
| Myocardial infarction (MI) | heart attack. Blood clot blocks coronary vessel |
| Thrombus | fixed clot |
| embolus | moving clot |
| Atherosclerosis | fatty deposits in walls = plaque consequence = buildup and blockage |
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HugsAndKisses