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Why do subcutaneous blood vessels bulge ...

Why do subcutaneous blood vessels bulge on the side away form the heart when the hand is tied?

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When the hand is tied the blood which is passing towards the heart is stopped. So the subcutaneous blood vessels bulge.
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VGS PUBLICATION-BRILLIANT-TRANSPORTATION - THE CIRCULATORY SYSTEM-QUESTIONS GIVEN IN THE LESSON
  1. Are all the chambers connected to each other?

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  2. What are the other differences could you observe between the chambers?

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  3. How are they connected to each other? How are they separated?

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  4. Do you find any specific observation in between two chambers?

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  5. How many times did your pointer touch the heart in fig. - 11(a) and (b...

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  6. What is the mechanism behind this?

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  7. Are root directly in contact with water?

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  8. How is water absorbed ?

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  9. Is there any increase in the water level?

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  10. What is the role of xylem?

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  11. What is the number of blood vessles attached to the heart?

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  12. Are all the blood vessels right ? How many of them are rigid?

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  13. Do you think that the stiffness/rigidity of blood vessel is something ...

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  14. Why do our legs swell?

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  15. Is there anything like that in plants which corresponds to circulatory...

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  16. Answer the following after reading the experiment conducted by Willia...

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  17. Why do subcutaneous blood vessels bulge on the side away form the hear...

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  18. The deep seated blood vessels bulge on the side towards the heart when...

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  19. There are valves in the heart between atria and ventricles. Is the pur...

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  20. After reading the experiments by Harvey fill in the following table. U...

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