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Cardiac arrhythmicity

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

List the cardiac pacemakers in order of fastest to slowest

Back (Answer)

Sinoatrial node Atrioventricular node Bundle of His Purkinje fibres

#2
Front (Question)

What is the pace of the SA node?

Back (Answer)

60-100 beats/min

#3
Front (Question)

What is the pace of the AV node?

Back (Answer)

40-60 beats/min

#4
Front (Question)

What is the pace of the bundle of His?

Back (Answer)

40-60 beats/min

#5
Front (Question)

What is the pace of the Purkinje fibres?

Back (Answer)

20-40 beats/min

#6
Front (Question)

What three tracts come off the SA node?

Back (Answer)

Anterior: Bachman’s bundle Middle: Weckenbach’s Posterior: Thorel’s

#7
Front (Question)

Describe an SA node action potential

Back (Answer)

4 0 3 4 Smooth

#8
Front (Question)

Describe a ventricular action potential

Back (Answer)

4 0 1 2 3 4 Pointy

#9
Front (Question)

How is a signal propagated in the heart?

Back (Answer)

From cell to cell

#10
Front (Question)

What does the heart form?

Back (Answer)

A functional syncytium

#11
Front (Question)

What allows the passage of ions between cells?

Back (Answer)

Gap junctions

#12
Front (Question)

What is the effect of the sympathetic nervous system on SA node action potential?

Back (Answer)

Sympathetic nervous system speeds up action potential

#13
Front (Question)

What is the effect of the parasympathetic innervation of the SA node?

Back (Answer)

Slows down action potentials

#14
Front (Question)

What is happening at phase 4 in the SA node?

Back (Answer)

Spontaneous depolarisation Slow influx leakage of Na+ Slow leakage of Ca2+

#15
Front (Question)

What is happening at phase 0 in the SA node?

Back (Answer)

Depolarisation Influx of Ca2+ Through L-type channels

#16
Front (Question)

What is happening at phase 3 in the SA node?

Back (Answer)

Repolarisation Efflux of K+ No Ca2+ comes in

#17
Front (Question)

What is happening at phase 0 in the AV node?

Back (Answer)

Rapid depolarisation Influx of Na+

#18
Front (Question)

What is happening at phase 1 in the AV node?

Back (Answer)

Partial repolarisation Na+ stops coming in K+ efflux

#19
Front (Question)

What is happening at phase 2 in the AV node?

Back (Answer)

Plateau phase K+ efflux Ca2+ influx

#20
Front (Question)

What is happening at phase 3 in the AV node?

Back (Answer)

Repolarisation K+ efflux No movement of Ca2+

#21
Front (Question)

What is happening at phase 4 in the AV node?

Back (Answer)

Ventricle diastole Pacemaker depolarisation Ions return to original location Via Na+/K+ATPase Na+/Ca2+ transporter Ca2+ ATP pump

#22
Front (Question)

What is the absolute refractory period?

Back (Answer)

A second action potential cannot be generated

#23
Front (Question)

What is the PQRST complex?

Back (Answer)

A heart beat seen on the ECG

#24
Front (Question)

What is P to R?

Back (Answer)

Atrial systole Ventricle diastole