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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