During the Refractory period of the action potential, the neuron will: Select one: O a. Not respond to any stimulus whatever its strength is O b. Respond to a weak stimulus by producing weak response c. Respond by rapid depolarization followed by repolarization d. Produce an action potential in response to a threshold stimulus e. Respond to all stimuli but with a weaker response

During the Refractory period of the action potential, the neuron will: Select one: O a. Not respond to any stimulus whatever its strength is O b. Respond to a weak stimulus by producing weak response c. Respond by rapid depolarization followed by repolarization d. Produce an action potential in response to a threshold stimulus e. Respond to all stimuli but with a weaker response

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter41: Neural Signaling

Section: Chapter Questions

Problem 4TYU: Saltatory conduction (a) requires more energy than continuous conduction (b) occurs in unmyelinated...

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Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
Saltatory conduction (a) requires more energy than continuous conduction (b) occurs in unmyelinated neurons (c) occurs when the action potential jumps from one node of Ranvier to the next (d) slows transmission of an impulse (e) depends on the action of GABA
Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed
During the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to threshold
What event triggers an action potential?a. Opening of sodium channelsb. Opening of delayed potassium channelsc. High concentration of negative ions outside the celld. Activation of the sodium–potassium pump5. Ordinarily, a neuron’s trigger zone is activated b
A change in the voltage across a neuron’s plasma membranethat makes the neuron less likely to fire an action potential isa. a change that makes the resting potential less negative.b. an excitatory postsynaptic potential.c. an inhibitory postsynaptic potential.d. a change that lowers the threshold.
Which of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.
During a relative refractory period of an action potential A. Another action potential can be fired, it just takes a greater stimulus for the membrane potential to reach threshold B. Na+ channels are either already open or are inactivated therefore the membrane absolutely can not produce another action potential, no matter how intense the stimulus C. Ca++ flows out of the cell, causing hyperpolarization and a need for a greater stimulus to generate the action potential D. The presynaptic neuron "tells" the postsynaptic neuron about the "relative" strength of signal E. None of the above are correct
Which is the correct order of the firing of a neuron? a. resting potential, threshold, action potential, refractory period b. resting potential, threshold, refractory period, action potential c. action potential, resting potential, refractory period, threshold d. threshold, resting potential, refractory period, action potential
increases the probability of producing an action potential, where a ________ decreases the probability of producing an action potential. A. threshold; hyperpolarization B. repolarization; depolarization C. depolarization; hyperpolarization D. hyperpolarization; depolarization E. depolarization, repolarization
MC: Which of the following changes to an action potential indicates a larger stimulus? Increased frequency Increased wavelength Increased amplitude Increased speed
Why are action potentials usually conducted in one direction?(A) Ions can flow along the axon in only one direction.(B) The brief refractory period prevents reopening of voltagegated Na+channels.(C) The axon hillock has a higher membrane potential thanthe terminals of the axon.(D) Voltage-gated channels for both Na+and K+open in onlyone direction.