Question

what is reflex action?
what is refllex arc?
plz explain clearly

Answer 1

HEY DEAR......!!!

reflex arc: the neural pathway over which impulses travel to produce a reflex action, consisting of at least one afferent (receptor) and one efferent (effector) neuron 

 

reflex action:Being an involuntary action or response, such as a sneeze, blink, or hiccup.


When a receptor is stimulated, it sends a signal to the central nervous system, where the brain co-ordinates the response.

 

But sometimes, a very quick response is needed, one that does not need the involvement of the brain. This is a reflex action.

 

Reflex actions are rapid and happen without us thinking. For example, you would pull your hand away from a hot flame without thinking about it. The diagrams below show each stage of the reflex arc. The yellow and green shape top rightof each diagram is a cross-section through the spine, as it would appear if you looked down through the head of the man whose shadow you see.


This is what happens:

a receptor detects a stimulus (change in the environment). This is indicated by the red on the hand.Top left: a sensory neurone sends a signal to the relay neurone.Top right: the relay neurone sends the signal to the motor neurone.Bottom left: the motor neurone sends a signal to the effector.Bottom right: the effector produces a response (the hand is pulled away quickly.)

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HOPE IT'S HELP U ☺

Answer 2

those action which can automatically done by our body is called reflex action
or the simplest form of response in the nervous system is called reflex action
and the pathway taken by nerve impulses in a reflex action is called reflex arc. hope this will help u and please mark as a brainlist answer