reflexes, unlearned, involuntary responses that occur automatically in the presence of certain stimuli (messages from your nerve cells), brain stem, structure that connects the brain and spinal cord; that controls involuntary actions, brain, The part of the central nervous system that is located in the skull and controls most functions in the body, spinal cord, bundle of nerves from the brainstem down your back that carries messages to and from your brain to all parts of your body., nerves, cells that carry impulses (messages) from all over your body to the brain..

Nervous System (M9, L2)

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