Many neurotransmitters trigger depolarisation by binding their receptors and gating an ion channel that allows Na influx. What happens if a neurotransmitter such as GABA, binds its receptor, gating a chloride channel (CI)? Select the (one) CORRECT answer. O a. The neuron becomes depolarised. O b. The membrane potential does not change OC. The neuron becomes hyperpolarised

Many neurotransmitters trigger depolarisation by binding their receptors and gating an ion channel that allows Na influx. What happens if a neurotransmitter such as GABA, binds its receptor, gating a chloride channel (CI)? Select the (one) CORRECT answer. O a. The neuron becomes depolarised. O b. The membrane potential does not change OC. The neuron becomes hyperpolarised

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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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
The resting membrane potential results fromA. uneven distribution of ions across the cell membrane only.B. differences in membrane permeability to Na+ and K+ onlyC. activity of the sodium/potassium pump only.D. uneven distribution of ions across the cell membrane, differences in membrane permeability to Na+ and K+, and sodium/potassium pump activity
Which of these terms is correctly matched with its definition ordescription?a. depolarization: membrane potential becomes more negativeb. hyperpolarization: membrane potential becomes more negativec. hypopolarization: membrane potential becomes more negative
The equilibrium potential for K* in neurons is ordinarily nearest- A. the equilibrium potential for Na* B. resting potential C. reversal potential for the EPSP D. the peak of the action potential
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.
atch the description with the statement that best describes the following statements hyperpolarization repolarization depolarization A. usually corresponds to opening of voltage-gated potassium channels B. any change in the membrane potential that moves the membrane potential to a value more positive than the resting potential (eg from -70mV to +35mV) C. any change in the membrane potential that moves the membrane potential to a value more negative than the resting potential (eg from -70mV to -85mV)
Which of the following statements is TRUE of the action potential? A. At the peak of the action potential there are approximately an equal amount of open voltage gated sodium and potassium channels B. To reach threshold the action potential requires the activity of sodium potassium pump C. During the rising phase (prior to the peak) of the action potential more voltage gated sodium channels are open than voltage gated potassium channels D. None of the choice options are TRUE of the action potential E. The overshoot phase (below resting membrane potential) is a result of voltage gated sodium channels taking a long time to close.
Each of the following is a correct relationship between action potential phase and channel status except Select one: O A. hyperpolarizing phase; Na channels open O B. repolarizing phase; K channels open O C. depolarization; Na channels open O D. hyperpolarizing phase; K channels open O E. repolarizing phase; Na channels closed
Which of the following primarily reflects the opening of voltage-gated Na+ channels? A. The resting membrane potential B. The depolarization phase of the action potential C. The threshold potential D. The repolarization phase of the action potential E. All of the above
Match the description with the statement that best describes the following statements hyperpolarization repolarization depolarization A. usually corresponds to opening of voltage-gated potassium channels B. any change in the membrane potential that moves the membrane potential to a value more positive than the resting potential (eg from -70mV to +35mV) C. any change in the membrane potential that moves the membrane potential to a value more negative than the resting potential (eg from -70mV to -85mV)
Voltage-gated Na+ channels open upon reaching what state? a. resting potential b. threshold c. repolarization d. overshoot
Depolarization and repolarization changes that occur during the action potential are produced by a. Negative feedback loops b. Channel mediated transport c. Simple diffusion of ions down their concentration gradient d. Active transport pumps along the neuron membrane