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Which is the correct route through which pulse making, impulse travels in the heart? (A) SA node - - - - AV node - - - Bundle of His - - - - Purkinje fibres (B) AV node - - - Bundle of His - - - - SA node - - - Purkinje fibres - - - heart muscles (C) AV node - - - SA node - - - Purkinje fibres - - - Bundle of His - - - heart muscles (D) SA node - - - Purkinje fibres - - - Bundle of His - - - AV node - - - heart muscles.

If there is a blockage between the AV node and AV bundle, how will this affect the appearance of the ECG /

Assertion : The AV node is also called as the pacemaker of the heart. Reasoning : It is because of the fact that the AV node determines the rate of heartbeat.

S.A Node and A.V Node

Assertion : Though AV node generates impulses, it is still not called as the pacemaker of heart. Reason : The rythmicity of impulse production is not highest in AV node in the neuromuscular conduction pathway.

State whether the triangles are congruent or not? Give reasonD AV70607

The cardiac phase between the closure of AV valves and opening of semilunar valves is

Time interval between the closure of semilunar valve and closure of AV valve is