Midterm I Terms - MIDTERM EXAM I TERMS PSYCHOLOGY I....

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MIDTERM EXAM I TERMS PSYCHOLOGY I. cellular structures and functions a. Neurons:  nerve cells that constitute the basic building blocks of the  nervous system Cell membrane:  formed from two layers of lipid molecules in  which proteins (ion channels, receptor molecules) float within. Dendrites:  small branching fibers that extend from the soma of a  neuron and receive messages from adjacent neurons. Soma:  cell body; location of the nucleus. Axon:  conducts electrical nerve pulses; regenerative. Axon terminal:  output zone. Axon hillock:  start of the signal. b. Glia:  glue! c. Action potential:  a nerve impulse resulting from the depolarization of an  axon’s cell membrane. Ion channel:  allows ions in and out of the neuron; gated or open. Sodium (Na+) channel:  most are gated; causes depolarization. Resting potential:  (-70mV). Depolarization:  when sodium rushes into the cell. Hyperpolarization:  when potassium rushes into the cell. Myelin sheath: 
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Midterm I Terms - MIDTERM EXAM I TERMS PSYCHOLOGY I....

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