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Question
Trace the sequence of events which occur when you suddenly touch a hot object.
Solution
When you suddenly touch a hot object, the sequence of events involves a reflex action, which bypasses the slower thinking processes of the brain to provide a quick response. The sensation of heat is detected by nerve endings, which send a signal through nerve cells to the spinal cord. This signal does not need to be processed by the brain to initiate a response.
Instead, a reflex arc in the spinal cord immediately sends a signal back through motor nerves to the muscles, causing you to withdraw your hand from the hot object quickly. This process allows for a rapid response to avoid injury, demonstrating the efficiency of reflex arcs in providing quick reactions to potential harm without the need for conscious thought.
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