Esdin LS 2 Lec 8 Cardio

The left side 4 of these 2 coming from each lung bring

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Unformatted text preview: nary veins Pulmonary veins to lungs Pulmonary trunk on the left side... 4 of these, 2 coming from each lung, bring blood to the atrium that is rich in oxygen, through bicuspic to ventricle then to the aorta artery that carries deoxygenated blood Inferior vena cava Blood Vessels of the Heart •  Superior vena cava –  Brings deoxygenated blood from all structures above diaphragm •  Inferior vena cava –  Brings deoxygenated blood from all structures below diaphragm 5 4/21/13 Blood Vessels of the Heart •  Pulmonary trunk –  Takes deoxygenated blood from the right ventricle to the lungs •  Pulmonary veins –  Bring back oxygenated blood from lungs to left atrium •  Aorta –  Delivers oxygenated blood from left ventricle to body Pathway of Blood Through the Heart 6 4/21/13 connective tissue in the valves do not have intercalated discs, then no contractions would occur Pathway of Blood Through the Heart vena cava Tri V SVC, IVC RA Pul S V RV PT pulmonary trunk Lungs Body Aorta Aor SV LV Bi V LA PVs the relaxed state Ventricular Diastole relaxation of the heart fills up with blood, when it contracts it pumps out that blood Aortic and pulmonary valves are closed Bicuspid and tricuspid valves are open so <3 fills up with blood 7 4/21/13 contraction period Ventricular Systole Aortic and pulmonary valves are open Bicuspid and tricuspid valves are closed to prevent backflow Electrical Activity of the Heart •  The heart is a cardiac muscle tissue that is constantly contracting (heart beat) •  Q: how does the heart contract? •  A: specialized cells called pacemaker cells that generate their own electrical build the depolarization, have activities to have action potential, have calcium available, troponin/ tropomyosin, etc. (everything found in muscles 8 4/21/13 Pacemaker Activities Sinoatrial node sends signal to signal comes to left atrium as well Atrioventricular node Bundle of His Bundle branches Purkinje fibers when signal reaches area, this is where the physical contraction occurs Pacemaker Cells •  Sinoatrial node (SA) located in the right atrium •  Atrioventricular node (AV) located on the interatrial septum •  Bundle of His: located on the interventricular septum •  Bundle branches •  Purkinje fibers: located on the ventricular walls 9 4/21/13 Cardiac Muscle Fibers Intercalated discs Plasma membranes Desmosome every single cell contracts at same time due to gap junctions Action poten...
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