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How many receptors in a human body ?

Important Questions on Control and Coordination

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Science>Biology>Control and Coordination>Animals Nervous System
Why is chemical communication better than electrical impulses as a means of communication between cells in a multi-cellular organism?
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Science>Biology>Control and Coordination>Animals Nervous System
Ram met with an accident. After that he lost the capacity to walk in straight manner and cannot smell anything. Which part of the brain got damaged in the above cases?
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Science>Biology>Control and Coordination>Animals Nervous System

Observe the given steps related to the experience of taste and arrange them properly.

  • Impulses reach the brain through the nerves.
  • The taste detecting chemoreceptors are stimulated.
  • The substances reach the taste buds through saliva.
  • Substances responsible for taste dissolves in saliva.
  • Forms the experience of taste.
  • Impulses form in the chemical receptors.
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Science>Biology>Control and Coordination>Animals Nervous System
How do nerve impulses travel in the body ? Explain.
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Science>Biology>Control and Coordination>Animals Nervous System

Write a and b in the given flow chart of neuron through which information travels as an electrical impulse.

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Science>Biology>Control and Coordination>Animals Nervous System

Name one gustatory receptor and one olfactory receptor present in human beings.

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Science>Biology>Control and Coordination>Animals Nervous System

Give one term for the following:

Receptors responsible for taste.

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Science>Biology>Control and Coordination>Animals Nervous System
Rafi said smell can also increase our appetite can you support this statement. How?
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Science>Biology>Control and Coordination>Animals Nervous System
How do we detect the smell of an incense stick (agarbatti)?
EASY
Science>Biology>Control and Coordination>Animals Nervous System

Rajesh feels hungry upon seeing food. Sheela says no to food as she is not hungry. What makes Rajesh hungry and what suppresses Sheela's hunger?

HARD
Science>Biology>Control and Coordination>Animals Nervous System
Why are dogs more capable than human beings in tracking the injured in collapsed building? Discuss.
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Science>Biology>Control and Coordination>Animals Nervous System
Classify receptors based on type of stimuli.
HARD
Science>Biology>Control and Coordination>Animals Nervous System

Match the terms of column I with those of column II.

Column I Column II
(A) Olfactory receptors (1) Tongue 

(B) Thermoreceptors (temperature receptors)

 (2) Eye
(C) Gustatoreceptors (3) Nose
(D) Photoreceptors (4) Skin
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Science>Biology>Control and Coordination>Animals Nervous System

Give reasons.

If glucose level falls in blood we feel hungry.

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Science>Biology>Control and Coordination>Animals Nervous System
What is the function of a receptor?
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Science>Biology>Control and Coordination>Animals Nervous System
A person suffering from severe cold is not able to feel the smell of a scented flower due to non-functioning of
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Science>Biology>Control and Coordination>Animals Nervous System
When a person is suffering from severe cold, he or she cannot
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Science>Biology>Control and Coordination>Animals Nervous System
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what the following are examples of:
(a) the smell of the food.
(b) the cells in your nasal passages which perceive the smell.
(c) the gland which is stimulated to secrete saliva.
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Science>Biology>Control and Coordination>Animals Nervous System

Explain why, the tongue may be considered to be both a receptor and an effector organ.

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Science>Biology>Control and Coordination>Animals Nervous System
When a person is suffering from severe cold, he or she cannot