When an action potential happens:OA Sodium rushes into the cell in the first stage creating depolarizationB. Potassium rushes into the cell in the second stage creating hyperpolarizaionC.It rises to +30, which is thresholdD.None of the above

A nerve cell is a specialized cell for the communication to transmit information between neuron…

Answered: When an action potential happens: OA…

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter29: Neural Control

Section: Chapter Questions

Problem 3SA: Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane...

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The accelerating flow of _______ ions through gated channels across the membrane triggers an action potential. a. potassium b. sodium c. hydrogen d. a and b
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?
Draw and label an action potential, indicating the ion movements responsible for the rising phase and the falling phase.
During the rising portion of the action potential, which ions are moving across the membrane and in which direction? A. Sodium ions move out. B. Sodium ions move in. C. Both sodium and potassium ions move in. D. Potassium ions move in.
During an action potential _______ A. Na+ flows out of cell and causes depolarization B. K+ flows into cell and causes repolarization C. Na+ flows into cell and causes depolarization D. K+ flows into cell and causes hyperpolarization
After the action potential reaches its peak, the potential across the membrane falls toward its resting level. What accounts for this recovery? a. The sodium–potassium pump removes the extra sodium. b. Potassium ions move out because their channels are open and the electrical gradient pushes them out. c. Potassium ions move out because their channels are open and the concentration gradient pushes them out. d. Potassium ions move in.
During the resting state, a neuron is: polarized with sodium ions outside the cell and potassium ions inside the cell restoring the ionic conditions utilizing the sodium-potassium pump depolarizing and generating an action potential propagating the action potential repolarizing as potassium ions diffuse out of the cell
What happens to the resting membrane potential if the extracellular K' concentration is increased. Select one: The resting membrane potential will become less negative. The resting membrane potential will not change. The resting membrane potential will become more negative.
The resting membrane potential of a neuron or muscle cell is a. equal to the potassium equilibrium potential. b. equal to the sodium equilibrium potential. c. somewhat less negative than the potassium equilibrium potential. d. somewhat more positive than the sodium equilibrium potential. e. not changed by stimulation.
A hyperpolarized cell can be generated when: Group of answer choices A. ligand-gated ionotropic channels for Cl- open B. voltage-gated Cl- channels in the postsynaptic membrane open C. Na + flows into the cell down its concentration gradient D. an action potential is generated in the postsynaptic membrane.
If the concentration of Na+ inside of a cell increases, the Nernst potential for Na+ will do what? Become more positive Become more negative Not change Not sure
The membrane potential caused by differences in ions across the plasma membrane of an electrically excitable cell (when not stimulated) is called: action potential resting membrane potential graded potential local potential

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When an action potential happens: OA Sodium rushes into the cell in the first stage creating depolarization B. Potassium rushes into the cell in the second stage creating hyperpolarizaion C.It rises to +30, which is threshold D.None of the above