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8 terms

ch 12 Synapses

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synapses
ends of axon which stimulate electrical activity
presynaptic neuron
first neuron in signal path which releases neurotransmitter. come in contact with dendrite, soma, or axon
postsynaptic neuron
second neuron which responds to neurotransmitter
synaptic cleft
gap between neurons
chemical synapses
how neurons communicate; by releasing chemicals
electrical synapses
exist in the cardiac and smooth muscle. has gap junctions which join adjacent cells. advantage is quick transmission. disadvantage cant turn off
synaptic knob
has synaptic vesicles which contains neurotransmitters
neurotransmitters
acetylocholine, amino acid neurotransmitters (GABA), monoamines (epinephrine, norepinephrine, dopamine) and neuropeptides (chains of 2 to 40 amino acids, gut brain peptides cause food cravings)