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Why is the sinoatrial node called t...

Why is the sinoatrial node called the pacmaker of heart ?

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Assertion : Sino-atrial node (SAN) is called the pacemaker Reason : SAN generates the maximum number of action potentials and is responsible for intiating and maintaining the rhythmic contractions of the heart.

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SURA PUBLICATION-TRANSPORTATION IN PLANTS AND CIRCULATION IN ANIMALS-ADDITIONAL QUESTIONS & ANSWER ( FILL IN THE BLANKS : )
  1. In translocation , food moves in the form of .

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  2. Guttation occurs through .

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  3. Why is the sinoatrial node called the pacmaker of heart ?

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  4. Atrioventricular bundle was discovered by .

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  5. The expansion of the artery every time the blood is forced into...

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  6. The sepuence of events occurring from the beginning to the comp...

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  7. Each cardiac cycle lasts about second

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  8. Relaxation of chembers of heart is called .

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  9. The first sound is produced by the closure of tricuspid and bic...

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  10. Every cell gets its enery by the breaskdown of .

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  11. Water and mineral salts absorbed by the roots reach all parts of...

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  12. The bulk movement of substance through the vascular tissue is ca...

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  13. The force of attraction between between molecules of differerent ...

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  14. Water molecules stick to

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  15. Water molecules stick to

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  16. is red coloured fluid connective tissure .

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  17. Sucrose moves into the companion cells , then into the living ...

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  18. the movement of sucrose produces a condition in the phloem .

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  19. Water or any liquid rises in the capillary tube because of .

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  20. The most abundant cells in the human body .

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