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Question

What prevents backflow of blood inside the heart during contraction?


A
Valves in heart
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B
Thick muscular walls of ventricles
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C
Thin walls of atria
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D
All of the above
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Solution

The correct option is A Valves in heart
Hint - Flow of blood in the heart is unidirectional in both right and left part of the heart.  This unidirectional flow is maintained by flaps like structure.

Part 1 - Heart 
  • Heart is the blood-pumping organ that pumps blood throughout the body with the help of blood vessels of the circulatory system. 
  • The heart is divided into two halves: right and left. Both the halves have 1 atrium (upper chamber) and 1 ventricle (lower chamber) each.

Part 2 - Valves
  • The atrium and ventricle have valves in between the chambers to prevent the backflow of the blood.
  • Between the right atrium and the right ventricle, the Tricuspid valve is present.
  • Between the left atrium and the left ventricle, the Bicuspid valve is present.
  • The semilunar valve is present between the ventricles and the pulmonary artery and the systemic aorta.

Part 3 - Conclusion
  • The four valves present in the heart prevents the backflow of blood inside the heart.
  • The thick muscular wall of ventricles (especially left ventricle) helps in sending blood to the entire body with pressure. 
  • The wall of atria is thinner than ventricles because they have to pump blood just to the ventricles and not to the body. 

Final step -  The Valves in heart prevent the backflow of blood inside the heart.

Biology

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