An action potential is best characterized as: Option A the movement of negative ions into and out of a neuron's dendrites Option B the movement of negative ions into and out of a neuron's axon Option C the movement of positive ions into and out of a neuron's dendrites Option D the movement of positive ions into and out of a neuron's axon
Added by Brian S.
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An action potential is a rapid electrical signal that travels along the membrane of a neuron, specifically along the axon, allowing the neuron to communicate with other cells. Show more…
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As part of a laboratory experiment in his psychology course, Miguel is observing the activity of a recording electrode on the axon of a neuron. As an action potential occurs, what might Miguel observe? A. The axon will release neurotransmitters into the synapse. B. The axon will remain at threshold potential as negative ions continue to flood the cell. C. The electrical charge of the neuron will go from positive to negative before returning to threshold potential. D. The electrical charge of the neuron will go from negative to positive before returning to resting potential.
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1) If there is an increase in the number of potassium leak channels, A. the cell is more likely to reach a threshold potential B. the cell is less likely to reach a threshold potential 2) An increase in intracellular calcium ions would result in which of the following A. depolarization of the neuronal membrane B. repolarization or hyperpolarization of the neuronal membrane C. no change in the polarization of the neuronal membrane 3) A decrease in the number of leak potassium channels would result in which of the following changes in the polarization of the neuronal membrane A. depolarization B. repolarization C. no change 4) Which of the following contributes to the formation of the 'resting membrane potential' in either a neuron or a muscle cell membrane? A. mechanically-gated channels B. ligand-gated channels C. more sodium leak channels than potassium leak channels D. large negatively-charged proteins within the cell 5) Which of the following could typically result in reaching the threshold potential required to open voltage-gated sodium and voltage-gated potassium channels? A. the formation of a graded potential by Cl- ions entering the neuron B. the formation of a graded potential by K+ ions leaving the cell C. the formation of a graded potential by Na+ ions entering the cell
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