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  • During cardiac cycle, the excitatory impulses are rapidly transmitted from AV node to all parts of the ventricles via   O

During cardiac cycle, the excitatory impulses are rapidly transmitted from AV node to all parts of the ventricles via 

 

Option: 1

bundle of His and Purkinje fibres

 


Option: 2

Postcaval and pre caval

 


Option: 3

AV Node

 


Option: 4

Dorsal aorta

 


Answers (1)

best_answer
 

Functioning of Human heart

  • The heart regularly and rhythmically contracts and relaxes at short intervals throughout life without pause and fatigue
  • The heart functions by collecting blood through both the atria and then distributing it through the ventricles
  • The action of the heart is a summation of contractions and relaxations of the atria and ventricles.
  • The contraction of the heart is called systole whereas the relaxation of heart is referred as a diastole
  • The atria and ventricles of the heart contract alternately.
  • A single contraction of heart followed by relaxation of heart constitutes a heart beat
  • Contraction of atria is initiated and activated by the SA node which then transmits these  waves of contraction across the walls of atria through muscle fibres.
  • When this wave of contraction originating from SA Node reaches the AV node, it gets  stimulated.
  • The excitatory impulses are rapidly transmitted from AV node to all parts of the ventricles via bundle of His and Purkinje fibres
  • These impulses causes contraction of ventricles simultaneously
  • The ventricles force blood through a long system of arteries and hence exert great pressure on the blood 
     

- 

As we have learnt:

The excitatory impulses are rapidly transmitted from AV node to all parts of the ventricles via bundle of His and Purkinje fibres. Hence, the correct answer is option a.

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Sayak

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