Question

Which one is the correct route through which impulse travels in the heart?

• A. SA node $\to$ Purkinje fibres $\to$ Bundle of His $\to$AV node $\to$ Heart muscles.
• B. AV node $\to$ SA node $\to$ Purkinje fibres $\to$ Bundle of His $\to$ Heart muscles.
• C. AV node $\to$ Bundle of His $\to$ SA node $\to$ Purkinje fibres $\to$ Heart muscles.
• D. SA node $\to$ AV node $\to$ Bundle of His $\to$ Purkinje fibres $\to$ Heart muscles.

Answer 1

The correct option is D SA node $\to$ AV node $\to$ Bundle of His $\to$ Purkinje fibres $\to$ Heart muscles.

Impulse for contraction starts in the SA node. From there it travels to the AV node. It is then conducted to the Purkinje fibres through the Bundle of His fibres. The Purkinje fibre situated in the lateral walls of the ventricles spread the impulse to the ventricles. Thus the ventricular contraction is initiated. The pressure exerted by the blood pushed into the aortic arteries is recorded as pulse.

So, the correct answer is 'SA node→AV node →Bundle of His →

→ Purkinje fibres →→ Heart muscles.→

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