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electrophysiology Quiz

electrophysiology Quiz Test

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Quiz Questions And Answers

how does the slow Ca current proceed in fast cells (what type of channels)

through slow Na/K leak termed If (funny current) toward -15 mV
through L type Ca channels (dihydropyridine type) and is linked to contractile force
ventricles depolarize and then contract on own, without receiving stimulu from atria via AV node

what can various drugs do to delay ventricular repolarization

very slow and very slow to incomplete
block K channels that normally open
when skeletal muscle is relaxed

what is bundle branch block

when skeletal muscle is relaxed
ventricular depolarization wave is slowed
uncoordinated atrial electrical activity

what receptor type is involved for parasympathetic effects on the heart

atrial depolarization
dromotropic effect
muscarinic types

what happens after the depolarization phase in fast cardiac cells

inward Ca current
high K permeability
long plateau phase

what type of sympathetic receptors increase contractility

electrical
muscarinic
beta1

what nervous system induces decreased Ca inward current and decraeses in conduction velocity

sympathetics
parasympathetics
acetylcholine

how do "slow" cells depolarize

the last cell to depolarize is the first tell to repolarize
slow cells in AV node or leaky cells in His-Purkinje system
through slow Na/K leak termed If (funny current) toward -15 mV

how is the T wave upside down

some but not all P waves fail to be conducted to the ventricles
return to the baseline, K permeability again is predominant
the last cell to depolarize is the first tell to repolarize

what type of sympathetic receptors increase HR

fast
beta2
beta1
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