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ECG Mock Test -1

1. Regarding ventricular muscle action potential, which is not true?

Platue occurs due to influx of K+

Depolarisation occurs due to influx of Na+

Repolarisation occurs due to efflux of K+

During repolarisation, Ca++ channel is closed

2. Not true about conduction speed (m/s):

SA node: 0.05

AV node: 2

AV bundle: 1

Perkinje fiber: 4

3. Why AV node is a slow conductor?

Less resistance

More gap junctions

Small diameter cells

More negative resting membrane potential

4. SA nodal current produces a vector which is –

Small vector with moderate velocity

Large vector with moderate velocity

Small vector with fast velocity

Large vector with fast velocity

5. Which part of the interventricular septum is stimulated first?

Upper and right

Lower and right

Lower and left

Upper and left

6. Which is not true regarding ECG waves?

P wave: Atrial depolarization

R wave: AV nodal depolarization

Q wave: Septal depolarization

T wave: Ventricular repolarization

7. ST segment denotes –

Completely depolarised ventricle

Completely depolarised atria

Completely depolarised AV node

Completely depolarised perkinje system

8. Not a property of cardiac muscle:

Automaticity

Synapse

Syncytium

Contractility

9. Sympathetic stimulation –

Decreased conduction

Increased heart rate

Decreased contractility

None

10. SA node is mostly supplied by –

Left anterior descending artery

Right coronary

Left circumflex artery

Diagonal artery

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