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Question

P-wave of ECG indicates:

(1) Depolarisation of atrial muscles

(2) Activation of the SA node

(3) Spread of excitation from the SA node to the V node

(4) Repolarisation of atria and depolarisation of ventricle


A

1 and 3 are correct.

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B

2 and 4 are correct.

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C

1 and 2 are correct.

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D

1, 2 and 3 are correct.

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Solution

The correct option is C

1 and 2 are correct.


The P wave is a small upward wave which represents electrical excitation or atrial depolarisation which leads to atrial contraction. The impulses of contraction start from the SA node as the P wave activates the SA node.


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