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How does the design of the body solve a ...

How does the design of the body solve a problem when immediate response is needed ?

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Reflex arc in the body design solve a problem, when immediate response needed.
`rarr` By reflex arc, the process of detecting signal or the input and responding to it by an output action is completed quickly.
`rarr` The thinking about sensation of external stimulus is not involved in case of immediate response.
`rarr` Nerves from different body parts to the brain meet in the spinal cord.
`rarr` In case of immediate response, impulse is not transmitted from spinal cord to brain.
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