1. It indicates the stimulus – response action. This stimulus response can be explained with an example.
2. Suppose a mosquito is biting you on your arm. Mosquito bite is stimulus.
3. The receptor in the skin responds and send the information in the form of electrical impulses through sensory nerve to spinal cord or brain.
4. Brain or spinal cord analyses the information that the mosquito bite is causing pains.
5. The brain or spinal cord sends the message through motor nerve to the effector organ i.e., hand to kill the mosquito.
6. As per the message our hand immediately hits the mosquito and kills it.
