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What is reflex action explain with diagram. |
| Answer» Answer: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:The reflex arc constitutes the following components:\tA receptor to perceive the stimulus.\tA sensory or afferent nerve which carries the message from the receptor to the spinal cord.\tThe neurons of spinal cord transmit the impulse from afferent neurons to efferent neurons.\tThe motor or efferent nerve carries messages from spinal cord to the muscles (effectors) that show the response.Some examples of reflex actions are:\tBlinking of eyes when a foreign particle gets in them.\tSneezing if an unwanted particle enters the nose.\tWatering of mouth at the sight or smell of good food.\tWithdrawal of foot while walking if a nail comes in the way and pricks the foot.\tImmediate withdrawal of hand of a person if some hot thing touches it. | |