Question

any agent or change in the environment that cause change or Reaction.​

Answer 1

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A stimuli is an agent or change in environment that causes a reaction by the nervous system.

When a sense organ receives a stimuli, like touching a hot object or thorn, the impulse travels through sensory neurons to the spinal cord, then the impulse is transferred to the association neurons and the response impulse is brought by the motor neurons to the muscles of the limbs. Thus, the hand is immediately removed from the hot object or thorn.

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Answer 2

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A stimuli is an agent or change in environment that causes a reaction by the nervous system.

When a sense organ receives a stimuli, like touching a hot object or thorn, the impulse travels through sensory neurons to the spinal cord, then the impulse is transferred to the association neurons and the response impulse is brought by the motor neurons to the muscles of the limbs. Thus, the hand is immediately removed from the hot object or thorn.