Please answer asap and in short Which one of the following statements about the propagation of the action potential is incorrect?O A. In a myelinated axon, the current responsible for the falling (repolarizing) phase of the action potential flows through the membrane in areas immediately adjacent tonodes of Ranvier.O B. More of the intracellular current flowing along the length of the interior of the axon is carried by K* ions than Na* ions.O C. Ahead of the moving action potential, most of the current flows out of the axon through open K* channels.O D. Action potentials travel more slowly in an axon with small diameter compared to an axon with large diameter.

The action potential is any shift in the membrane potential due to an increase or decrease of…

Which one of the following statements about the propagation of the action potential is incorrect? O A. In a myelinated axon, the current responsible for the falling (repolarizing) phase of the action potential flows through the membrane in areas immediately ac nodes of Ranvier. B. More of the intracellular current flowing along the length of the interior of the axon is carried by K* ions than Na* ions. C. Ahead of the moving action potential, most of the current flows out of the axon through open K* channels. moll with Jorgo diomotor

Which one of the following statements about the propagation of the action potential is incorrect? O A. In a myelinated axon, the current responsible for the falling (repolarizing) phase of the action potential flows through the membrane in areas immediately ac nodes of Ranvier. B. More of the intracellular current flowing along the length of the interior of the axon is carried by K* ions than Na* ions. C. Ahead of the moving action potential, most of the current flows out of the axon through open K* channels. moll with Jorgo diomotor

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 8TYK: Which of the following statements best describes saltatory conduction? a. It inhibits direct...

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Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?
Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.
Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
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
Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.
Draw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.
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
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
The transmission of action potentials down a myelinated axon is faster but "saltatory" because of which of the following? A. the passive transmission of action potentials is faster but degrades the action potential B. voltage-gated sodium channels are only found in the Nodes of Ranvier C. active transmission of action potentials does not degrade the action potential but is slow D. A and C are correct E. all of the above are correct
Which of the following is TRUE regarding the absolute and relative refractory periods of the action potential (AP)? A. The absolute refractory period may be overcome if enough excitatory stimulation is applied to the neuronal membrane. B. The absolute refractory period is due the closing of the activation gate of voltage gated sodium channels at the peak of the AP. C. The relative refractory period is due to the closing of the activation gate of voltage gated potassium channels during the overshoot phase of the AP. D. The relative refractory period is due the closing of the inactivation gate of voltage gated sodium channels . E. All of the above statements are FALSE.
The absolute refractory period of an action potentialA. only ensures one-way travel down an axon.B. only allows a neuron to ignore a second signal sent that closely follows the first.C. only prevents summation of action potentials within the axonD. ensures one-way travel down an axon and allows a neuron to ignore a second signal sent that closely follows the firstE. ensures one-way travel down an axon, allows a neuron to ignore a second signal sent that closely follows the first, and prevents summation of action potentials within the axon