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WorksheetsElectrical Signals of Nerve Cells
Total questions: 12
Worksheet time: 6mins
The resting membrane potential typically ranges from _______ to _______.
How will a neuron respond to an injection of negative current?
It will generate a single action potential
It will have a positive electrical response.
The amplitude of the action potential of a given neuron is ___.
larger in response to depolarizing currents of greater magnitude.
dependent on the magnitude of the sensory stimulus.
always the same
related to the number of synapses on the neuron.
smaller if the resting potential of the neuron is lower.
Which type(s) of electrical signals occur(s) within the neural circuit for a spinal reflex?
Receptor potential only.
Action potential only.
Synaptic potential only.
Receptor potential and action potential only.
Receptor potential, synaptic potential, and action potential.
An action potential occurs if current injected into a neuron _______ the neuron to reach _______ potential.
depolarizes; synaptic
hyperpolarizes; synaptic
depolarizes; threshold
hyperpolarizes; threshold
hyperpolarizes; resting
Subthreshold current injected into an axon flows _______ along the axon and _______ with distance from the site of injection.
actively; remains constant
actively; decays
actively; grows
passively; remains constant
passively; decays
Which is the leading hypothesis about the proposed actions of inhalation anesthetics?
The anesthetics open Na+ channels that create the resting membrane
The anesthetics close the 2-P K+ channels that create the resting membrane
They hyperpolarize the resting membrane potential of neurons thus making it more difficult to fire action potentials.
It is thought that they depolarize the resting membrane potential of neurons thus making action potentials fire.
What is the mechanism of action of most local anesthetics?
Hyperpolarize resting membrane potential of neurons
Block glutamate receptors in excitatory synapses
Enhance the activity of inhibitory synapses by acting on postsynaptic GABA receptors
Block Na+ channels involved in the generation of action potentials
Bind opiate receptors
In a two-compartment model of a cell with a K+-permeable membrane and a tenfold excess of K+ in the inside compartment, how would the membrane potential change if all K+ ions were replaced by Na+ ions?
No potential would be generated
It would double.
It would be reduced by half.
It would not change.
It would become positive.
Which statement best describes the Nernst equation?
It relates the equilibrium potential of an ion to its intracellular concentration.
It relates the equilibrium potential of an ion to its extracellular concentration.
It relates the equilibrium potential of an ion to its intra- and extracellular concentrations.
It relates the equilibrium potentials of multiple ions to their intracellular concentrations.
It relates the equilibrium potentials of multiple ions to their intra- and extracellular
21. Concentrations of which ion, inside and outside of a neuron, have the greatest effect on the resting membrane potential?
Sodium
Potassium
Chloride
Magnesium
Calcium
Which state of the plasma membrane does NOT occur during an action potential?
Rising phase
Overshoot phase
Undershoot phase
