Cell body Dendrites Axons Action potential Depolarization Hyperpolarizati on Threshold All-or-none response Synapse Neurotransmitt ers Acetylcholine Dopamine Serotonin Norepinephrine GABA Glutamate Endorphins Agonist Antagonist Motor cortex Sensory cortex Broca’s area Wernicke’s area CNS Peripheral Nervous system Autonomatic Somatic Sympathetic Life support center Receive messages from other neurons Covered with myelin sheath, sends messages through neurons A neural impulse; brief electrical charge that travels down an axon generated by movement of positively charged atoms in and out of the channels in axon’s membrane Positive ions enter the neuron making it more susceptible to an action potential Negative ions enter the neuron making it more susceptible to an action potential When the depolarizing current minus the hyper exceed minimum intensity, the neuron fires an action potential In order to receive a response, the threshold must be exceeded Gap between 2 neurons Chemical messengers released from s...