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chapter12 (12.1 (major blood vensselst (superior vena cava brings blood…
chapter12
12.1
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fibrous pericardium...outermost tough fibrous protective CT layer that prevents overstretching of the heart
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chorde tentinease tendon like fibrous chords that connect the cups of AV valves to the papillary muscle of ventricles
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chordae tendineae " tendon like fibrous cords that connect the cusps of av valves to the papillary valves
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kahoots
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sa node, av node, av bundle, purkinje fibers
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if the conccection between the sa node and av node becomes blockes.... the venticles will beat independently of the atraia
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12.2
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the frank starling law of the heart says that strength increases as venous return increases ( blood flow into the heart must be pumped out)
sinoatrial node SA located in the right upper most atrial wall
impulse travels throughout atrial fibers via gap junctions in intercalated discs to the..
atrioventricular node AV located in interatrial septum serves as a delay that allows for ventricular filling
atrioventricular bundle only electrical; connection between the atria and ventricles located in the superior interventricular septum
right and left bundle fibers lead downward through interventricular septum toward the aapex and impulse finally reaches
purkinje fibers large diameter conduction myofibers located within the papillary muscles of the ventricles conduct the impulses into the mass of the ventricular muscle tissue
electrocardiogram a recording of the electrical changes that occur ut the myocardium during the cardiac cycle
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12.4
cardiac output CO the volume of blood pumped by each ventricle in one minute
SV volume of blood pumped out by a ventricle with each beat
Noramal co 5 ;liters
lower temp slows deplarization of sa node lower heart rate decreased contraction
higher temp increases heart rate strength of contraction
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