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The increased heat sends a nerve impulse from the burning area to the spine. Here the somatosensory neurone (the one conveying the heat) activates a motor neurone (one which initiates movement). This motor neurone sends an impulse to the muscle controlling the hand, making the muscle contract and making the hand move away from the heat source.

At the same time, the somatosensory neurone also sends a message to the brain, which is percieved as pain (hence why burning yourself hurts).

Inflammation may occur in the burnt tissue as a response, increasing fluid levels in the damaged tissue, producing a blister. This helps the damaged tissue to heal.

The actual mechanisms of these events are ridiculously complex, this is a simplified version.

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A thermal energy diagram, also known as a heat flow diagram, illustrates how heat energy flows through a material like rock, showing the temperature changes and distribution within the material. It demonstrates how heat affects the rock by indicating areas of heat gains and losses, as well as the distribution of thermal energy within the rock material.

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