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InterviewSolution
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7. What is meant by reflex-action? With the help of a labelled diagram trace the sequence of eventswhich occur when we touch a hot object. |
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Answer» REFLEX ACTION THE AUTOMATIC, INSTANTANEOUS ACTION DUE TO AN EXTERNAL OR INTERNAL STIMULUS WITHOUT ANY CONSCIOUS THOUGHT MADE BY THE GREY MATTER OF SPINAL CORD IS CALLED REFLEX ACTION. SEQUENCES OF EVENTS WHEN WE TOUCH A HOT OBJECT RECEPTORS PRESENT IN THE SKIN ACCEPT THE EXTERNAL STIMULUS THAT THE OBJECT IS OVERHEATED. THE SIGNAL IS CARRIED BY THE AFFERENT NERVES TO THE NERVE CENTER WHICH IS THE GRAY MATTER OF SPINAL CORD WHERE THE INSTANTANEOUS DECISION IS MADE. EFFERENT NERVES CARRY THE SIGNAL FROM NERVE CENTER TO THE MUSCLES. THEN AND THEN WE LIFT UP OUR HAND. A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain. |
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