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biology

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

A

SA node Purkinje fibres Bundle of His AV node Heart muscles.

B

AV node SA node Purkinje fibres Bundle of His Heart muscles.

C

AV node Bundle of His SA node Purkinje fibres Heart muscles.

D

SA node AV node Bundle of His Purkinje fibres Heart muscles.

Answer

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. 


 

Answered By

toppr

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