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L9_Electrical activity of the heart and ECG , Physio

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1- Chest leads are 6 unipolar leads in which the ECG is recorded with electrodes placed on the anterior surface of the chest over the heart; which

one is placed in the 5th intercostal space in the midclavicular line:

a) V1.

b) V2.

c) V3.

d) V4.

e) V5

 



2.the first point to depolarize is also the first point to repolarize in 

a)cardiac muscle fibres

b) skeletal muscle fibres



3.chest leads are:. 

a) bipolar leads

b) unipolar leads

c) both 



4.normal cardiac axis is :.

Downword, forward to the left

Dawnword, backword to the left

Upword, forward to the right




5.Einthoven's law there are :.

The voltage of lead 1=lead 11+lead 111

The voltage of lead 11= lead 1+lead 111

The voltage of lead 111= lead 1+lead 11



 



6. Lead 11 measures the potential difference between

Rt.arm & Lt.arm

Lt.arm & Lt.leg 

Rt.arm & Lt leg 





7. Negative wave (downword deflection) present in normal ECG in :.

aVR

aVL

aVF






8. Ventricular depolarisation in ECG represent

P wave

QRS wave

T wave

U wave 





9……..measures atrial depolarization & conductivity in the A-v node

P-R interval

Q-T interval 

S-T segment


Answers

1_D

2_B

3_B

4_A

5_B

6_C

7_A

8_B

9_A











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