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Why is chemical signal required along wi...

Why is chemical signal required along with electrical impulses in higher animals ?

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In higher animals, electrical impulses bring immediate response to only those cells that are connected by nervous tissue while chemical signals reaching to each and every cells of body.
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KUMAR PRAKASHAN-CONTROL AND COORDINATION-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions in short : )
  1. What is an impulse ?

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  2. What is gustatory receptors ? Where they located ?

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  3. By what is nervous tissue made-up of ? What is its special ability ?

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  4. State any two examples of movement in order to protect ourselves.

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  5. What are components of peripheral nervous system ?

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  6. Which separate areas are there in fore-brain ?

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  7. Why thinking is called a complex activity ?

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  8. How do we know that we have eaten enough ?

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  9. Which involuntary actions are controlled by medulla in the hind-brain?

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  10. How do animal muscles move ?

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  11. How does a muscle cell move ?

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  12. How do muscle cells change their shape ?

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  13. How does leaves of chhui-mui respond to touch stimulus ?

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  14. Why are hormones called chemical messengers ?

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  15. Which plant hormone inhibits growth ? State its effect.

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  16. Why is chemical signal required along with electrical impulses in high...

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  17. Who constitutes a second way of control and coordination in our body ?

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  18. Where is auxin synthesised and where does it diffuses ?

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  19. Secretion of which hormone in males and in females is responsible for ...

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  20. State the secretory site and function of growth hormone releasing fact...

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