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  • Systole is contraction of  Option: 1 AV node  <div class='qna-opt

Systole is contraction of

 

Option: 1

AV node

 


Option: 2

SA node

 


Option: 3

Major arteries

 


Option: 4

Atria and ventricle

 


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 
     

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As we have learnt:

A heart beat consists of contraction and relaxation of atria and ventricles. The phase of contraction is referred to as systole while the phase of relaxation is called diastole. Hence, the correct answer is option d.

Posted by

Irshad Anwar

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