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unit 2 pt 1

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
Sensory/Afferent Neurons   Carry info from senses to the brain  
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Motor/Efferent Neurons   Carry info from the brain to the muscles  
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Interneurons   Acts as a middle man/ bridge between sensory and motor neurons  
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Dendrites   Receives messages and conducts impulses toward the cell body (tree branch)  
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Soma (cell body)    
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Axon   Knoblike; transmits messages to the other neurons or muscles or glands  
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Myelin Sheath   Fatty tissue; speeds impulses  
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Terminal Buttons   The branching structures at the ends of axons that release neurotransmitters  
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Synapses   Tiny space between the axon terminal & dendrite  
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Depolarization   Sodium gates open and let sodium into the axon, causing the axon to be more positive that the outside  
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Action Potential   A neural impulse; a brief electrical charge that travels down an axon  
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Resting Potential   The electric potential across the plasma membrane of a neuron when it is in the nonexcited, or resting, state  
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Reuptake   Reabsorptions of the neurotransmitters by sending neuron once message has been received (send & come back)  
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Refractory Period   A period of inactivity after a neuron has fired  
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All-or-none response   A neurons reaction of either firing or not firing  
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Agonist   A substance that binds to a receptor and triggers a response in the cell  
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Antagonist   A molecule that inhibits or blocks a neurotransmitter's action  
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Excitatory   Neurotransmitters that increase likely action  
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Inhibitory   Neurotransmitters that decrease likely action  
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Acetylcholine (ACH)   (I&E) A neurotransmitter involved in learning, memory, and muscle contraction (+ spams) (- Alzheimers)  
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Norepinephrine   (E) A neurotransmitter important in controlling alertness, wakefulness, mood, and attention (fight/flight) (+agitation) (-depression)  
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Glutamate   (E) Transmit information that regulates brain development and determines cellular survival (+migraines/ seizers) (-  
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Dopamine   (E&I) voluntary movement and rewards (+ schizophrenia) (- addiction/ Parkinsons)  
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Serotonin   A neurotransmitter that regulates sleep, mood, appetite, and body temperature  
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GABA   Calming / stop button (-insomnia) (- seizures/anxiety)  
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Blindsight   A condition in which a person can respond to a visual stimulus without consciously experiencing it  
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Selective attention   Focusing of conscious awareness on a particular stimulus; the brain's ability to choose a focus and what to notice  
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Inattentional blindness   Failing to see visible objects when attention is directed elsewhere  
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Change blindness   Failing to notice change in the environment  
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Circadian rhythms   Regular bodily systems that occur on a 24 hour cycle  
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Tolerance   Diminishing effect with regular use of the same dose of drug  
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Withdrawal   The discomfort & distress that follows discontinuing an addictive drug or behavior  
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Depressants   Chemicals that reduce neural activity & other body functions  
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Stimulants   Drugs which intensify neural activity & bodily functions  
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Barbiturates   Drugs that depress central nervous activity; reducing anxiety but impairing memory & judgement  
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Opiates   Opium & its derivatives that depress neural activity temporarily lessening pain & anxiety  
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NREM 1   Experiences hallucinations & hypnagogic sensations, thea waves, light sleep  
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NREM 2   Sleep spindles, sleep talking, spend most night sleep here  
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NREM 3   Slow & large delta waves, bedwetting, sleepwalking & nightmares may occur  
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NREM 4   Rapid eye movement sleep, vivid dreams, paradoxical sleep, brain is very active  
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REM cycle   Rapid eye movement sleep; a recurring stage of sleep during which vivid dreams occur; also known as paradoxical sleep because the muscles are relaxed but body systems are active  
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Sleep spindles   Sudden bursts of rapid brain wave activity  
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Wish Fufillment   To want to satisfy your own wishes  
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Manifest Content   The remembered storyline of a dream  
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Latent Content   The underlying meaning of a dream  
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Activation Synthesis   Develop and preserve neural pathways  
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Information Processing   File away memories  
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Insomnia   Reoccurring problems in falling or staying asleep  
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Narcolepsy   Uncontrollable sleep attacks  
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Sleep apnea   Temporary sensations of breathing during sleep & repeated momentary awakenings  
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Night terrors   High arousal & an appearance of being terrified  
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