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- A man becomes unconscious due to head injury. A pin is pricked on his foot, he withdraws his foot. Why. Explain
. A man becomes unconscious due to head injury. A pin is pricked on his foot, he withdraws his foot. Why. Explain
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Ans: It is reflex action. Stimulus is perceived by receptor (skin). Sensory nerve sends the sensation from receptor to the spinal cord. Then, spinal cord sends the message through motor nerves to the effectors. Effectors i.e. muscles help in withdrawing his foot
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