Answer:
Spinal cord
Explanation:
Central nervous system consists of two parts Brain and Spinal cord.
Brain control major body function like sensation, movement, memory.
spinal cord collects information from body sends it to brain and then get information from brain and send it to whole body
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The answer is unconditioned stimulus and unconditioned response in which in classical conditioning if the sour taste of lemon juice spontaneously reasons the mouth to pucker the lemon juice is the unconditioned stimulus and the pucker of the lips and tongue is the unconditioned response. In addition, classical conditioning plays a significant role in which the progress of emotional responses such as anxiety or embarrassment.