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What is the reason for the Lubb- dubb s...

What is the reason for the Lubb- dubb sounds of the heart?

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BEYOND PUBLICATION-TRANSPORTATION - THE CIRCULATORY SYSTEM-EXERCISE
  1. What is the reason for the Lubb- dubb sounds of the heart?

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  2. Who invented stethoscope?

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  3. Before inventing stethoscope, how they hear heart beat?

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  4. What is the material used to make stethoscope?

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  5. Who coinded the name form paper/ bamboo tube to hear heart beat?

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  6. The term cardiac refers to which organ in the body

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  7. On which side of the human heart is low in oxygen?

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  8. Which structures of the heart control the flow of the blood?

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  9. Which of the following opinions is correct?

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  10. An aphid pierces its proboscis into the………to get plant juices?

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  11. What is the function of stomata in plants?

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  12. Why are xylem and phloem called complex tissues?

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  13. Sieve tubes have

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  14. Tracheids are seen in

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  15. Ascent of water and minerals through xylem in plants

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  16. Translocation of sucrose takes place through

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

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  18. What is the heart beat rate in children aged between 1 -10 years?

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  19. Pulmonary artery which supplies deoxygenated blood to lungs arise from...

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  20. Who studied the physiology of heart for the first time?

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  21. We are the microscopic vessel made of single layer of cells. We allow ...

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