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[A] : [A]: ECG is a record of electrical...

[A] : [A]: ECG is a record of electrical activity of the heart that shows certain waves called PQRS and T waves.
[R]: It gives important information concerning the spread of excitation to the different parts of heart and helps in diagnosis of heart disorders.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Go through the following statements (i) Vagus nerve decreases the rate of impulse formation from the SA node and its conduction (ii) As the human heart is myogenic in nature, the rate of formation and conduction of cariac impulse cannot be changed by the action of nerves (iii) The end of T-wave in ECG marks the end of systole. (iv) If the P-wave in ECG is inverted , it indicates that SA node fails to initiate impulse and the atrial muscle depolarises by the impulse originating in A.V. node. Whic of these are correct ?

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