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Q.

Choose the incorrect match(es).

I. Atrial systole – SA Node

II. Ventricular systole – AV Node

III. Purkinje fibres – Ventricles

IV. Lub sound – Closing of semilunar valves

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a

II and IV

b

 I and III

c

Only IV  

d

 III, and IV

answer is C.

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Detailed Solution

  • Atrial systole: The contraction of the atria, initiated by the SA node, pushes blood into the ventricles.
  • Ventricular systole: The contraction of the ventricles, delayed by the AV node, pumps blood out of the heart.
  • Purkinje fibers: Specialised muscle fibers in the ventricles that rapidly conduct electrical impulses for coordinated ventricular contraction.
  • Lub sound: The "lub" sound corresponds to the closing of the AV valves, marking the start of ventricular contraction and preventing backflow into the atria.
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