Term
| Characteristics of Electrical Synapse |
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Definition
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| Characteristics of Chemical Synapse |
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Definition
Most predominant Not structurally connected Transmitter released through exocitosis Unidirectional flow Need mitochondrial energy for the enzymes that synthesize the transmitters.
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Definition
Synapse is at the soma(cell body) of the next neuron. Stronger signal because it has to go a shorter distance to reach trigger zone. |
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Definition
Synapse is at a dendrite of the next neuron. Proximity to trigger site determines how strong the signal will be when it reaches there. |
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Definition
Synapse is at the axon terminus of the next neuron. Controls the release of transmitters by the next neuron. |
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Term
| Whats the only exampl of a one-to-one Synapse? |
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Definition
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Term
| Features of Chemical Synaptic Transmission (Step by Step) |
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Definition
Presynaptic Action Potential→ Depolarization causes more permeability to Ca++ ions→ Release of transmitter through exocitosis→ Transmitter reacts with post-synaptic receptor→ Channels open, Postsynaptic potential→ Action Potential
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Definition
Packets that the transmitters are traveling in |
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Definition
How many transmitters are in each Quanta |
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Definition
The amount of potential that each Quanta produces. |
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Term
Excitatory Postsynaptic Potentials (EPSPs) |
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Definition
Postsynaptic potentials that depolarize the membrane tend to excite the nerve cells to discharge action potentials. opening Na channels closing K or Cl
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Definition
Consecutive synaptic potentials arrive at the postsynaptic cell and add together. |
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Definition
Two seperate inputs arrive simultaneously at the postsynaptic cell and add together. |
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Definition
Excititory Enhances the release of transmitters Presynaptic inhibition would do the opposite |
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Term
Facilitation or potentiation- |
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Definition
No time to bring Ca++ levels down. Describes a progressive increase in the amount of transmitter release by successive action potentials during a brief stimulus train lasting up to a few seconds. Facilitation dies away rapidly, within tens to hundreds of milliseconds after the end of stimulation. |
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Term
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Definition
Large Membrane describes an increase in transmitter release by an actionpotential following repetitive stimulation of a synapse. Posttetanic potentiation requires seconds to develop and lasts tens of seconds to several minutes after cessation of tetanic stimulation. PTP occurs at the neuromuscular junction. PTP might well be a mechanism of “short-term” memory in the CNS. |
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Definition
| Depleting transmitter stores. Like a seizure |
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Term
| What is the mechanism and signal properties Electrical PSP? |
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Definition
Mechanism: ΔVoltage, ΔpH, ΔCa++ Signal properties: Graded, Fast |
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Term
| Receptor Potential (type and mechanism of ion channel..signal properties) |
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Definition
Type: single class channels for Na+ and Ka+ Mechanism: Sensory stimulus Signal Properties: Graded, Fast |
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