Blood-brain barrier - inability of some substances to penetrate the brain tissue, Cerebral Ventricles - four cavities within the brain that are filled with cerebrospinal fluid, Convolutions - elevated folds on the surface of the cerebrum that increase the surface area of the brain, CVA - cerebrovascular accident; stroke, Dementia - loss in at least two areas of complex behaviors, Fight or Flight response - body perceives danger and prepares to run away or stand and fight; heart rate increases, mouth becomes dry, and pupils and bronchi dilate, Gyri - convolutions in the brain, Lumbar puncture - a needle is inserted between two vertebrae to remove a sample of cerebrospinal fluid, Neurotransmitter - a chemical messenger that carries, boosts, and balances signals between neurons (ex. Acetylcholine), Paralysis - the loss of the ability to move (and sometimes to feel anything) in part or most of the body, typically as a result of illness, poison, or injury, Stimulus - something that can elicit or evoke a physiological response in a cell, a tissue, or an organism,

3.03 Key Terms - Nervous System

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