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SLCC 2420 Melissa Jacobsen chapter 8 Questions and Answers
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SLCC 2420 Melissa Jacobsen chapter 8
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SLCC 2420 Melissa Jacobsen chapter 8Synapses - answer Communication from a neuron to another neuron and effector
organs (muscle or gland)
Two types:: Electrical and Chemical
Electrical Synapses - answer Electrical synapse - ions move from cell to cell causing a
change in charge gap junction
Chemical Synapses - answer Specialized for release and reception of chemical
neurotransmitters. Requires a chemical (neurotransmitter)
presynaptic neuron - answer A presynaptic neuron is a neuron (nerve cell) that fires the
neurotransmitter as a result of an action potential entering its axon terminal
postsynaptic neuron - answerthe neuron on the receiving end of the synapse from the
presynaptic neuron
synaptic cleft - answerThe narrow gap that separates the presynaptic neuron from the
postsynaptic cell.
unidirectional - answermoving in only one direction, ie the per to post synaptic
Voltage-gated Ca2+ channels - answerdepolarization causes these channels to open.
synaptic vesicles - answerMembrane-bounded compartments in which synthesized
neurotransmitters are kept.
ways to get rid of neurotransmitters - answerreuptake molecules: the persynaptic
reabsorbs the neurotransmitter
degradation of neurotransmitter: enzymes degrade neurotransmitter in synapse
diffusion of neurotransmitter: it is flushed out of the synaptic cleft
ligand-gated channels - answerchannel that opens when a neurotransmitter attaches
G-protein linked receptors Also called metabotropic receptors - answerG-protein signals
ion channel directly
G-protein activates a protein that makes second messenger
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