terms 2 psych - Yaunek Murray Period 1 Chapter 2 Terms...

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Yaunek Murray Period 1 Chapter 2 Terms Biological psychology: a branch of psychology concerned with the links between biology and behavior. Neuron: nerve cell; basic building block of nervous system. Dendrite: the bushy branching extensions of neuron that receive messages and conduct impulses toward the cell body. Axon: the extensions of a neuron, ending in branching terminal fibers, through which messages pass to other neurons or to muscle glands. Myelin sheath: encases fibers of many neurons; enables vastly greater transmission speed of neural impulses as the impulse hops from one node to the next. Action potential: a neural impulse; a brief electrical charge that travels down the axon. Threshold: level of stimulation required to trigger a neural impulse. Synapse: junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron. Neurotransmitters: chemical messengers that traverse the synaptic gaps between neurons. Acetylcholine: a neurotransmitter that triggers muscle contraction. Endorphins: “morphine within” natural opiate-like neurotransmitters linked to pain control and pleasure. Nervous system: the body’s primary information system. Central nervous system: also called the CNS is the part of our nervous system made of the brain and spinal cord.
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