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19 Cards in this Set
- Front
- Back
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abnormal pace maker that takes over the pacing of the heart
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Ectopic focus
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the set pace set up by AV node 40-60 beats per minute
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junctional rhythm
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small region of heart hyperexcited, too much coffe, smoking, caffiene, generates more quickly to SA node
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extrasystole (premature contractions)
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damage to AV node
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Heart block
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cardiac centers are located in
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medulla oblongata
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projects to sympathetic neurons in the T1-5 level of spinal cord(preganglionic neurons)
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cardioacceleratory center
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sends impulses to the parasympathetic dorsal vagus nucleus in the medulla which sends inhibiting impulse to heart via branches of vagus nerve
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cardioinhibitory center
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listening to lub dub in stethoscope Thorax ausculated
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heart sounds
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all events associated with blood flow through heart during one complete beat
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cardiac cycle
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contraction and relaxtion periods
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systole and diastole
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mid to late diastole
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ventricle filling
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pressure in heart is low: blood returning
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ventricular filling (mid to late) diastole
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as atria relax, ventricle begins to contract
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ventricular systole
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ventricles are completely closed chambers blood volume in chambe remains constant
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isovolumetric contraction phase
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pressure in aorta noramally reaches 120mm, SL valves forced open blood rushes into aortic and pulmonary trunks
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ventricular ejection phase
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closure of the aortic valve cause brief rise in aortic pressure as back flowing blood rebounds off the closed valve cusps, event begins at the
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dicrotic notch
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a period of total heart relaxation
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quiescent period
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degree at which the cardiac muscles cells stretch before contraction
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preload (frank starling law
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the amount of blood returning to the heart and distending its ventricles
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venous return
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