Which Of The Following Statements About Receptor Potentials Is False Blood / Gas Station For Sale In Arkansas

Tuesday, 30 July 2024
According to the Nernst equation, which of the following will depolarize Vm, the membrane potential? Prevent its development by blocking ion channels from the inside. There are relatively few ion channels per mm2 in the axonal membrane. C. At the membrane, the ion movements change the distribution of charges on the membrane capacitance. This shows that a. the Na+/K+ pump is not required for an action potential to be generated.

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After that, the inactivation gate re-opens, making the channel ready to start the whole process over again. Increased Na+ conductance --> depolarization --> increased K+ conductance and Na+ inactivation --> decreased K+ conductance. Tetrodotoxin (TTX), a toxin extracted from the tropical puffer fish, has the property of selectively blocking Na+ axonal channels. The refractory period occurs because a. the neuron cannot fire again until the membrane potential returns to below threshold. Which of the following is most responsible for the all-or-none property of the action potential? Return of the membrane potential to its normally negative voltage at the end of the action potential.

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It would increase the flow of sodium out of the cell. D. They help supply metabolic substrates to neurons. After infusing TTX in the extracellular bath (normal salt water), you perform a voltage clamp experiment on a squid giant neuron. What would the wavelength of maximum output be for infrared radiation from the surface of Mercury? Trigger zones of an axon. Timed with the peak of depolarization, the inactivation gate closes. Which of the following describes a change from the resting membrane potential? No action potential, since supra-threshold stimuli must be applied on a dendrite to be effective. One of the early signs of cell disease is this "leaking" of sodium ions into the body cells. A decrease in the rate of propagation of the action potential.

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One is the activation gate, which opens when the membrane potential crosses -55 mV. D. It is a function of the insulating properties of the membrane. Any depolarization that does not change the membrane potential to -55 mV or higher will not reach threshold and thus will not result in an action potential. However, it does not open as quickly as the voltage-gated Na+ channel does. Very different, because lidocaine had no effect. Which of the following statements regarding cardiac pacemaker cells is false?

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So touching a hot pan, for example, would result in the rapid firing of a nerve impulse that would result in an immediate response. Net inward current produced by the cell due to the influx of both K+ and Na+ ions. Mechanically gated channel. Leakage channels contribute to the resting transmembrane voltage of the excitable membrane (Figure \(\PageIndex{5}\)). E. A neuron must normally make synaptic contact with another cell in order to exert control. The process of conduction of an action potential involves the following steps *a. depolarization --> increase Na+ conductance --> increased K+ conductance and Na+ inactivation --> decreased K+ conductance. A ligand-gated Na+ channel will open when a neurotransmitter binds to it and a mechanically gated Na+ channel will open when a physical stimulus affects a sensory receptor (like pressure applied to the skin compresses a touch receptor). Chemically gated sodium channels to open. B. its membrane permeability.

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This statement *a. is true because the concentrations of the inward and outward flowing ions don't change appreciably over time in normal cells. ISBN: 9781259864568. A greater-than-threshold depolarization results and sodium permeability into the cell increases to overcome the potassium exiting. John David Jackson, Patricia Meglich, Robert Mathis, Sean Valentine. A single action potential traveling away from the cell soma, toward the end of the axon. An action potential from node to node of a myelinated nerve. If the nodes were any closer together, the speed of propagation would be slower.

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Measurement of the net current flowing across the membrane of a neuron can be made with a. an intracellular microelectrode. As Na+ spreads along the inside of the membrane of the axon segment, the charge starts to dissipate. A mechanically gated channel opens because of a physical distortion of the cell membrane. E. An increase in Faraday's constant. E. Voltage-gated Na+ channels. This type of channel is also known as an ionotropic receptor because when the ligand, known as a neurotransmitter in the nervous system, binds to the protein, ions cross the membrane changing its charge (Figure \(\PageIndex{2}\)). Initiation of the action potential usually occurs _______of the neuron. Copyright 1999 University of Bristol. C. The change in the membrane potential will remain constant throughout the length of the membrane. Clinical Reasoning Cases in Nursing. Stimulating the cell until it responds. D. The cell would no longer be in a steady state.

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Another term for nerve fiber. A response is then triggered in these, for instance, a muscle may contract, or a gland may secrete a substance. The number of action potentials increases. Neurons that relay sensory signals to integrative centers of the CNS are called. The separation of positive and negative charges constitutes. If you get something wrong, hit the 'reload' button on the browser and retry the question. The conversion of a stimulus to a change in membrane potential. Intro into Philosophy. Stimuli such as odor molecules or taste molecules trigger receptor potentials in nerve cells. The rate at which a neuron can fire is determined by its absolute refractory period, which is the period of time after a cell fires, during which it cannot generate another action potential regardless of the stimulus's intensity. D. the difference in applied voltage.

When the intensity of the appropriate stimulus was increased, the amplitude of the response _______. The net current flowing across the membrane in either direction. Because there is not constant opening of these channels along the axon segment, the depolarization spreads at an optimal speed. C. They act as metabolic intermediaries between capillaries and neurons.

That allows different ions to pass through when the membrane potential is near zero than when it does when the membrane potential is near resting level. The membrane becomes less polarized. Before these electrical signals can be described, the resting state of the membrane must be explained. Astrocytes can become reactive in cases such as these, which impairs their ability to maintain the local chemical environment. Ouabain blocks the voltage-sensitive K+ channels needed to recover from action potentials. Sets found in the same folder. Continuous conduction. E. Either a or c, depending on the type of axon.

The membrane potential during an EPSP. During the resting membrane potential. In this analogy, the stimulus represents the force applied to the trigger while the firing of the gun represents the action potential. A. Ligand-gated Na+. Unfortunately, they accidentally clamped the squid axon at -80 mV instead of 0 mV, in normal saline. More action potentials to occur.

Another term for a neuron. It is important to realize that we have two main nerve tracts: sensory fibers which take signals to the brain and motor fibers which take information away from the brain. The capacitance of the membrane due to the lipid bilayer.
This starts with a channel opening for Na+ in the membrane. Students also viewed. However, a slight difference in charge occurs right at the membrane surface, both internally and externally. "Sodium inactivation" refers to a. the inability of sodium to move across the membrane. 150. a glass microelectrode is used to iontophoretically adjust ion concentrations to so as to hold membrane potentials at pre-selected values. Houston: USA, Rice University. The nerve signal is conducted along these fibers until it reaches the target gland or muscle which is an effector.

D. The action potential lasts about 3 ms. e. In the recovery phase, Na+ channels are closed. It might take a fraction of a millisecond for the channel to open once that voltage has been reached. However, they both move down their respective gradients, toward equilibrium. C. revealed the quantitative movements of ions across the membrane that lead to an action potential. Suppose you apply electrodes to the middle of a squid giant axon and apply a supra-threshold stimulus.

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