Flashcard Set Preview
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| 1 |
1. conduction system is specialized for what 2 things?2. Conduction system consists of what...
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1. generating rhythmical electrical impulses & rapid conduction of impulses throughout...
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Sinoatrial Node1. location2. aka?3. RMP4. slow leakage of ___ into cell results in what?5....
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1. located in sulcus btw superior vena cava and right atrium2. primary pacemaker of the heart3....
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1. 3 parts of preferred conduction pathway btw SA and AV nodes2. what also links 2 atria electrically...
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1. anterior internodal tractmiddle internodal tractposterior internodal tract2. anterior internodal...
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Atrioventricular Node1. location2. conduction thru the AV compared to SA- why is this the case?3....
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1. located in posterior wall of right atrium behind tricuspid valve2. slower- allows time for...
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AV BUndle1. aka?2. contiguous of what?3. consists of what 2 parts and where they carry the...
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1. common bundle2. AV node3. (1) penetrating portion= passes thru fibrous tissue btw atria...
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Bundle BRanches1. AV bundle divides into what?2. where?3. these 2 divisions course where?
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1. L & R bundle branches2. ventricular septum3. down medially toward apex, around ventricles...
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Purkinje Fibers1. terminal Purk, fibers become continuous with what?2. velocity of conduction...
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a
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Electrical SIgnal Flow1. depolarization of auto rhythmic cells rapidly spread to adjacent contractile...
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1. gap junctions2. electrical precedes mechanical (except in heart transplant)3a. AP from auto...
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Ectopic Pacemaker1. definition2. can occur where?3. can arise in which situations?
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1. pacemaker other than SA node2. can occur in other parts of the conduction system or in atrial...
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1. electrolyte responsible for RMP in muscle and nodal fibers2. electrolytes primarily responsible...
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1. potassium2. nodal- Ca is primary with Na playing less of a rolemuscle- Na is primary with...
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Action Potentials in Cardiac Muscle1. Phase 42. Phase 0 - which channels?3. Phase 1 - which...
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1. Resting Membrane Potential (dependent on K)2. depolarization= influx of Na via voltage gated...
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| 12 |
Duration of Cardiac Action Potential1. ventricular muscle2. atrial muscle3. action potential...
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1. 300msec2. 200msec3. duration of contraction4. gives ventricles time to fill5. wave summation
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1. 3 Na channel states2. AP are generated by ___ cells3. the P, the QRS, and the T waves each...
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1. open, inactive and closed2. individual3. P= phase 0 of atrial action potentialQRS= phase...
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| 14 |
1. different K channels2. two types of Ca channels3. Na channels
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1. K leakage channelsK(r)- rapid actingK(to)= transient outwardK(s)- delayedK(1)- inwardly...
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Diff btw fast and slow response cell types1. location2. rate of depolarization3. major ionic...
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1. fast= atria, ventricles, His/ purkinjeslow= SA and AV nodes2. fast/ slow3. fast- Na; slow-...
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HCN channel1. stands for what?2. found where?3. beginning of what?4. threshold? level at which...
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1. hyper polarization activated cyclic nucleotide gated channel2. brain and heart3. pacer activity4....
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Automaticity1. pacemaker membrane potential2. I-f channels: Na influx3. Ca channels: influx...
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a
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1. def of automaticity2. inherent rates in following sections:a. SA nodeb. AV nodec. purkinje...
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1. intrinsic ability to generate AP's2a. 60-100 bpsb. 40-60 bpsc. 15-40 bps
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1. mechanism (2 parts) of slow depolarization in purkinje fibers2. mechanisms of slow depol...
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1. increased Na permeability and decreased K permeability2. incr Na permeability, decr K permeability,...
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AP in SA/ AV nodes1. phase 0- d/t what electrolyte?(differs from purkinje and ventricular muscle...
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1. rapid influx of Ca2. absent - there's no plateau d/t efflux of K being greater than influx...
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| 21 |
1. 3 factors that affect HR2. SNS causes what 2 effects?3. PNS causes what 2 effects?
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1. - alteration of slope of the diastolic depolarization(dcrs rate - less of a slope)- alteration...
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Sympathetic effect1. increases heart rate by which 2 things?2. NTM and receptor- what happens?3....
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1. incr Ca and incr I-F channel flow2. NE - B1 causes increase in cAMP--> opens HCN channel...
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ParaSYmpathetic1. slows rate by which 2 things?2. NTM and receptor - does what?3. 2 final results**...
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1. incr K efflux and dcrs Ca influx2. Ach - M1 --> inhibits cAMP --> closes HCN channel...
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1. heart rate reflex range2. typical resting rate
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1. 50- near 2002. near 70
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| 25 |
a
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a
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