Electrical Signals of Nerve Cells

The resting membrane potential typically ranges from _______ to _______.

• 10mV to -30mV
• 0mV to -50mV
• -100mV to -200mV
• 50mV to 100mV
• -40mV to -90mV

How will a neuron respond to an injection of negative current?

• Depolarization
• Increased firing rate
• It will generate a single action potential

• It will have a positive electrical response.

• Hyperpolarization

Tags

NGSS.HS-PS3-5

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.

Tags

NGSS.HS-PS3-5

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

Tags

NGSS.HS-PS2-5

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.

Tags

NGSS.HS-PS1-2

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