Question

What is reflex action? Explain with the help of examples.

OR

What are reflex actions? Give two examples. Explain a reflex arc.

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Answer 1

Answer:

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Answer 2

A reflex action is defined as a spontaneous, automatic and mechanical response to a stimuli without the will of an individual. In such actions there is no involvement of the brain. All reflex actions are conveyed through the spinal cord by a path called reflex arc.

The reflex action travels in the following sequence:

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The reflex are constitutes the following components:

$\longrightarrow$ A receptor to perceive the stimulus.

$\longrightarrow$ A sensory or afferent nerve which carries the message from the receptor to the spinal cord.

$\longrightarrow$ The neurons of spinal cord transmit the impulse from afferent neurons to efferent neurons.

$\longrightarrow$ The motor or efferent nerve carries messages from spinal cord to the muscles (effectors) that show the response.

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Some examples of reflex actions are:

$\longrightarrow$ Blinking of eyes when a foreign particle gets in them.

Sneezing if an unwanted particle enters the nose.

$\longrightarrow$ Watering of mouth at the sight or smell of good food.

$\longrightarrow$ Withdrawal of foot if a nail comes in the way while walking and pricks the foot.

$\longrightarrow$ Immediate withdrawal of hand on touching some hot thing.

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