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If we happen to touch a hot object unkno...

If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type action known as ?

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Reflex action
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What is the push or pull on an object known as ?

The organ A which is located inside the skull of our body is protected by a bony box B and it is surrounded by three membranes C. the space between the membranes is filled with a liquid D which protects the organ A from mechanical shocks. The organ A in combination with another organ E makes up the central nervous system. (a) What is organ A? (b) What are (i) B (ii) C, and (iii) D ? (C) Name the organ E. (d) While walking barefooted, it we happen to step on a sharp piece of stone, we immediately lift our foot up. which of the two organs, A or E, is directly involves in this action? (e) If we step out from a darkened room into bright sunshine, we close our eyes for a moment. Which of the two organs, A or E, is directly involves in this action?

Paheli accidently placed her hand over a flame and immediately pulled it back. She felt the sensation of heat and reacted due to the action of

We move our hands while walking for

Explain why, if we touch the test-tube immediately after carrying out the neutralisation reaction of an acid and a base in it, it is found to be somewhat hot.

When we touch a hot plane unknowingly then this heat is sensed by a receptor P present in oyr fingers. The receptor triggers an impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls or hand away from the hot plate. (a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R? (b) What is (i) neuron S, and (ii) neuron T? (c) Name the tissue U. (d) What name is given to the phenomeon in which hand is pulled quickly from the hot plate? (e) Name the effector in this whole process.

What happens to the springs of a sofa when we sit on it ?

What happens to our hearing abilities as we grow old ?

LAKHMIR SINGH & MANJIT KAUR-CONTROL AND COORDINATION -Exercise
  1. Name the two systems of control and coordination in higher animals.

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  2. What are the two parts of the vertebrate nervous system?

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  3. If we happen to touch a hot object unknowingly, we immediately pull ba...

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  4. Name the three components of a neuron (or nerve cell).

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  5. (a) What are the short fibres of a neuron known as? (b) What is the ...

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  6. Name the most important part of the human brain.

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  7. Which part of the brain maintains posture and equilibrium of the body?

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  8. State one function each of cerebellum and pons.

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  9. Name one hormone secreted by the pituitary gland.

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  10. Where are hormones made in the human body?

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  11. What is the name of the system of glands which produces hormones?

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  12. Which gland secretes the growth hormone?

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  13. Name the hormones secreted by (a) testes, and (b) ovaries

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  14. What are the scientific names for the following receptors in animals? ...

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  15. Name the disease caused by the deficiency of thyroxine hormone in the ...

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  16. Which halogen element is necessary for the making of thyroxine hormone...

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  17. Why are some patients of diabetes treated by giving injections of insu...

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  18. What is the name of in-built 'arrangement' in our body which controls ...

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  19. Which part of the eye contains cells which are sensitive of light?

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  20. What are the two main communications system in an animal's body?

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