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AP Psych: Unit 2 - Biological Bases of Behavior

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Terms in this set (123)

a nerve cell; the basic building block of the nervous system

the part of a neuron that contains the nucleus; the cell's life-support center

a neuron's often bushy, branching extensions that receive and integrate messages, conducting impulses toward the cell body

the neuron extension that passes messages through its branches to other neurons or to muscles or glands

a fatty tissue layer segmentally encasing the axons of some neurons; enables vastly greater transmission speed as neural impulses hop from one node to the next

glial cells (glia)

cells in the nervous system that support, nourish, and protect neurons; they also play a role in learning, thinking, and memory

action potential

a neural impulse; a brief electrical charge that travels down an axon

the level of stimulation required to trigger a neural impulse

refractory period

in neural processing, a brief resting pause that occurs after a neuron has fired; subsequent action potentials cannot occur until the axon returns to its resting state

all-or-none response

a neuron's reaction of either firing (with a full-strength response) or not firing

the junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron, the tiny gap at this junction is called the synaptic gap or synaptic cleft

neurotransmitters

chemical messengers that cross the synaptic gaps between neurons

a neurotransmitter's reabsorption by the sending neuron

"morphine within" - natural, opiate-like neurotransmitters linked to pain control and to pleasure

a molecule that increases a neurotransmitter's action