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Question
Define reflex arc. Give the flow chart of a spinal reflex arc.
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Solution
The path travelled by an impulse during a reflex action is called a reflex arc.
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RELATED QUESTIONS
Briefly explain the following terms : Reflex action
Name the most important part of the human brain.
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When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and 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 our 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.
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(e) Name the effector in this whole process.
Multiple choice question. Tick (✓) the correct choice:
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- medulla oblongata
- spinal cord
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Lifting up a book: …………………..
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State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
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The hand automatically shows the direction to turn a cycle without thinking.
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Response to a stimulus without the intervention of the will of an animal.
Mention, if the following statement is True or False
Reflex action involves brain
A change in the environment that causes an animal to react is called ______.
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