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Question

(a) What is a reflex action? Explain with the help of an example.
(b) Define reflex arc. Give the flow chart of a spinal reflex arc.
(c) How are involuntary actions and reflex actions different from each other?


Solution

(a) Reflex action is a rapid and automatic response to a stimulus. It is not under the voluntary control of the brain. For example, if we unknowingly touch a hot plate, we immediately move our hand away from it.
(b) The path travelled by an impulse during a reflex action is called a reflex arc.

Spinal reflex arc:


(c) 
Involuntary actions Reflex actions
These are normal involuntary actions of internal or external organs of the body. These are sudden involuntary responses to external stimuli.

Science
Lakhmir Biology 2013
Standard X

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