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What prevents backflow of blood inside t...

What prevents backflow of blood inside the heart during contraction?

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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LAKHMIR SINGH & MANJIT KAUR-TRANSPORT IN ANIMAL AND PLANTS-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 contraction?

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

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

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

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

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  8. Coagulation of blood in a cut or would is brought about by :

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

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  10. The filtering unit in the human excretory system is called:

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  11. The procedure of cleaning the blood of a person by using a kidney mach...

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

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  13. The exchange of material between the blood and surrounding cells takes...

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  14. Arteries normally carry oxygen rich blood whereas veins normally carry...

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  15. Arteries normally carry oxygen rich blood whereas veins normally carry...

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  16. If a person drinks very less water during the day, the quantity of uri...

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  17. Name an animal which excretes cell waste in gaseous form (ammonia) whi...

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  18. Name the animals which excretes a semi-solid white coloured compound u...

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  19. The human body has an organ A which acts as a pump. The pump A pumps a...

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  20. The human body has an organ A which acts as a pump. The pump A pumps a...

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