electrophysiology Quiz

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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electrophysiology Quiz