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5 Cards in this Set
- Front
- Back
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What is the structure that joins two neurons at an electrical synapse?
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At an electrical synapse, neurons are joined by GAP JUNCTIONS.
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Events at a chemical synapse usually involve opening of both VOLTAGE-GATED ion channels & CHEMICALLY GATED ion channels. Where are these ion channels located and what causes each to open?
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VOLTAGE GATED ion (Ca2+) channels are found in the presynaptic Axon terminal & open when an action potential reaches the Axon terminal. CHEMICALLY GATED ion channels are found in the postsynaptic membrane and open when neurotransmitter binds to the receptor protein.
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Which ions flow through chemically gated channels to produce IPSPs?
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IPSPs result from the flow of either K+ (potassium) or Cl- (chloride) through chemically gated channels.
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Which ions flow through chemically gated channels to produce EPSPs?
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EPSPs result from the flow of both Na+ (sodium) and K+ (potassium) through chemically gated channels.
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What is the difference between temporal summation and spatial summation?
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TEMPORAL summation is summation in TIME of graded potentials occurring in quick succession at the postsynaptic membrane. It can result from EPSPs arising from just one synapse.
SPATIAL summation is summation in SPACE a postsynaptic neuron is stimulated by a large number of terminals at the same time. |
