Sheryl accidentally placed her hand over a flame and immediately pulled it back. She felt the sensation of heat and reacted due to the action of

Blood cells

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Skin surface

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Nerve cells

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Nucleus of cells

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Solution

The correct option is D Nerve cells
When sheryl places her hand on the flame, the impulses of heat pass through nerve cells (also known as neurons) of her hand, travel through the neurons of her arm and reach the brain. The brain after receiving these signals, in turn, sends a reaction signal under the effect of which Sheryl jerks off her hand from the flame.
Neurons actually work by transferring electrical charges from one neuron over to the next till the signal reaches the brain

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