Set: Action Potentials - 3

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All 19 Terms

Term Definition
Cell Body (Soma) contains nucleus (genes) and endoplasmic reticulum (protein synthesis)
Dendrites receptive area of a neuron.
Axon contains axon hillock (signal initiation), myelin sheath (insulation), and nodes of Ranvier (signal relay sites).
Pre-synaptic Terminals output area, location of synapse and site of neurotransmitter release.
Input Conductance a measure of the electrical conductance of a neuron to input current.
Membrane Capacitance influences the time course of the change in Vm.
Axial Conductance is less in long dendrites and is greater in large-diamter dendrites.
Length Constant indicates the distance that the change in membrane potential has decayed to 37% (1/e) of its initial value.
Electrotonic Conduction the passive spread of voltage changes along a neuron, dependent on length constant.
Voltage Clamp Technique a technique that regulates membrane potential and makes it possible to determine the effect of Vm on the current due to different ions.
Reversal Potential when the net force acting on an ion changes direction (obtained through a series of voltage clamps).
Action Potential the activation signal evoked in a neuron when the Vm crosses a certain threshold.
Adaptation an observed slowing of action potential frequency in a neuron (slow to open K channels).
Extracellular Recording a recording that measures the local current flows outside of a cell.
Intracellular Recording a recording of neuronal electrical activity that involves measuring the transmemrane changes in voltage.
Motor Neuron send action potentials to muscle and activate the contractile proteins to produce a muscle contraction.
Electromyography (EMG) an extracellualr technique used to record muscle fiber action potentials.
Interference EMG the signal that represents the sum of the positive and negative muscle fiber action potential phases.
Cancellation the loss of signal amplitude in an emg recording.

Set Information

Terms 19
Creator pascoe
Created February 21, 2007
Groups None
Tags science, iphy, pascoe, physiology, cu, boulder
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Description

Electrical Signaling by Neurons

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Most Missed Words

  1. Pre-synaptic Terminals → output area, location of synapse and site of neurotransmitter release. - 2 misses
  2. Electrotonic Conduction → the passive spread of voltage changes along a neuron, dependent on length constant. - 2 misses
  3. Cell Body (Soma) → contains nucleus (genes) and endoplasmic reticulum (protein synthesis) - 1 miss
  4. Membrane Capacitance → influences the time course of the change in Vm. - 1 miss
  5. Length Constant → indicates the distance that the change in membrane potential has decayed to 37% (1/e) of its initial value. - 1 miss
  6. Voltage Clamp Technique → a technique that regulates membrane potential and makes it possible to determine the effect of Vm on the current due to different ions. - 1 miss
  7. Adaptation → an observed slowing of action potential frequency in a neuron (slow to open K channels). - 1 miss