Answered: 8. What is the single most important…

8. What is the single most important piece of information in determining the response of a post- synaptic cell?

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Chapter12: The Nervous System And Nervous Tissue

Section: Chapter Questions

Problem 29RQ: How much of a change in the membrane potential is necessary for the summation of postsynaptic...

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Similar questions

Which of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.
1. An action potential does occur in response to a _____ , which strong enough to depolarize the membrane to threshold.
9 Describe how the sequential opening and closing of voltage-gated sodium and potassium channels leads to depolarization and repolarization of the membrane and results in the propagation of a signal along the axon of a neuronal cell
2. Discuss the role of ion channels in the initiation of neuronal excitability.
18. How is a nerve impulse transmitted across a synapse from a presynaptic to a postsynaptic cell? a. via a direct connection b. via a electrical spark c. via a neurotransmitter d. via Na+ ions e. Both a and b are correct answers
4. Which term describes the cell membrane potential of a neuron at rest? a. polarized b. depolarized c. hyperpolarized d. repolarized e. sympolarized
Which of the following means the ability to transmit electrical current from one cell to another? A. Conductivity B. Excitability C. Contractility D. Automaticity
An example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.
Which of the following is probably going to propagate an action potential fastest? a thin, unmyelinated axon a thin, myelinated axon a thick, unmyelinated axon a thick, myelinated axon
The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
After an action potential, the opening of additional____voltage-gated ____ channels and The inactivation of sodium channels, cause the membrane to return to its resting membrane potential. sodium potassium calcium chloride
How much of a change in the membrane potential is necessary for the summation of postsynaptic potentials to result in an action potential being generated? +30 mV +15 mV +10 mV -15 mV