EKG and Electrical Pathway of the Heart

Which component of ECG cycle shows ventricular depolarisation?

• P

• QRS

• T

• U

In the diagram below, which part of the tracing represents the contraction of the atria?

• P

• T

• R

• S

One small square on ECG tracing paper _______

• is 1 mm by 1 mm

• represents 0.04 seconds

• represent 0.1mV

In the 6 second strip below, the heart rate is

• 7

• 60

• 70

• 75

Where is V1 located?

• 4th intercostal space at the left margin of sternum

• 4th intercostal space at the right margin of sternum

• 5th intercostal space at mid clavicular line

• 3rd intercostal space at mid axillary lline

Name part of red

• T wave

• Q wave

• R wave

• S wave

Name the lead

• aVF

• aVR

• aVL

• aVS

Represents the early part of ventricular repolarisation

• QT interval

• PR interval

• ST segment

What part of the electrical conduction system is labelled A?

• SA Node

• AV Node

• AV Bundle

• Bundle Branches

• Purkinje Fibers

What part of the electrical conduction system is labelled D?

• SA Node

• AV Node

• AV Bundle

• Bundle Branches

• Purkinje Fibers