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What prevents backflow of blood inside t...

What prevents backflow of blood inside the heart during contration ?

A

thick muscular walls of ventricles

B

valves

C

thin walls of atria

D

all of the above

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The correct Answer is:
B
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What prevents backflow of blood inside the heart during contraction ?

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. What prevents backflow of blood inside the heart during contraction?

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LAKHMIR SINGH & MANJIT KAUR-LIFE PROCESSES-Exercise
  1. Blood is pumped from the heart to the entire body by the:

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  2. The blood leaving the tissues becomes richer in

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  3. What prevents backflow of blood inside the heart during contration ?

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  4. Choose the correct path of urine in our body

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  5. In which of the following vertebrate group/groups,heart does not pump ...

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  6. Which vein brings clean blood from the lungs into the heart ?

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  7. Which blood vessel does not carry any carbon dioxide ?

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  8. It has been found that people living in very high mountains have many ...

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  9. The phloem tissue in plants is responsible for the transport of :

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  10. Which of the following has a three-chambered heart ?

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  11. In which of the following are the largest amount of nitrogen excreted ...

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  12. Which one of the following has cytoplasm but no nucleus :

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  13. The process of carrying food from the leaves to other parts of a plant...

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  14. Which of the following is the only conducting tissues in non-flowering...

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  15. Which of the following helps in the upward movement of water and disso...

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  16. Which one of the following does not have valves ?

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  17. Which of the following is accomplished in a plant by utilising the ene...

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  18. Coagulation of blood in a cut or wound is brought about by :

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  19. The blood vessel which carries oxygenated blood from the lungs to the ...

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  20. The instrument for measuring blood pressure is called :

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