CONNECT ACCESS FOR BIOL 01204 <C>
12th Edition
ISBN: 9781264443123
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 42, Problem 1U
Which of the following best describes the electrical state of a neuron at rest?
a. The inside of a neuron is more negatively charged than the outside.
b. The outside of a neuron is more negatively charged than the inside.
c. The inside and the outside of a neuron have the same electrical charge.
d. Potassium ions leak into a neuron at rest.
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Students have asked these similar questions
Which of the following best describes the electrical state of a neuron at rest?
a. The inside of a neuron is more negatively charged than the outside.
b. The outside of a neuron is more negatively charged than the inside.
c. The inside and the outside of a neuron have the same electrical charge.
d. Potassium ions leak into a neuron at rest.
All of the following factors contribute to a polarized membrane EXCEPT which?
a. Negative ions such as chlorine become concentrated inside the neuron.
b. Negatively charged proteins and potassium ions are concentrated inside the neuron.
c. A sodium–potassium exchange pump moves sodium out of and potassium into a neuron.
d. Sodium ions become more concentrated inside the neuron and potassium ions become more concentrated outside the neuron.
Which of the following statements does NOT correctly describe the repolarization of a neuron?
a. The potassium channels are slower to open, allowing the potassium ions to leave after depolarization.
b. The potassium ions leave the cell, thereby returning the neuron to its resting potential.
c. The neuron becomes more polarized and more negatively charged than its original resting membrane potential.
d. The sodium and potassium channels open, allowing the positive ions to move out of the cell.
Chapter 42 Solutions
CONNECT ACCESS FOR BIOL 01204 <C>
Ch. 42.1 - Differentiate between subdivisions of the...Ch. 42.1 - Prob. 2LOCh. 42.1 - Explain the roles of the different nervous system...Ch. 42.2 - Contrast the relative concentrations of important...Ch. 42.2 - Prob. 2LOCh. 42.2 - Prob. 3LOCh. 42.3 - Prob. 1LOCh. 42.3 - Prob. 2LOCh. 42.3 - Prob. 3LOCh. 42.4 - Prob. 1LO
Ch. 42.4 - Prob. 2LOCh. 42.4 - Prob. 3LOCh. 42.5 - Describe the organization of the peripheral...Ch. 42.5 - Prob. 2LOCh. 42.5 - Prob. 3LOCh. 42.5 - Prob. 4LOCh. 42 - Data analysis Draw the resulting potentials for...Ch. 42 - Prob. 2DACh. 42 - Which of the following best describes the...Ch. 42 - The ____ cannot be controlled by conscious...Ch. 42 - Prob. 3UCh. 42 - Inhibitory neurotransmitters a. hyperpolarize...Ch. 42 - White matter is ______, and gray matter is...Ch. 42 - During an action potential a. the rising phase is...Ch. 42 - Prob. 7UCh. 42 - Imagine that you are doing an experiment on the...Ch. 42 - The Na+/K+ ATPase pump is a. not required for...Ch. 42 - Prob. 3ACh. 42 - The following is a list of the components of a...Ch. 42 - Prob. 5ACh. 42 - As you sit quietly reading this sentence, the part...Ch. 42 - G proteincoupled receptors are involved in the...Ch. 42 - Tetraethylammonium (TEA) is a drug that blocks...Ch. 42 - Describe the status of the Na+ and K+ channels at...Ch. 42 - Describe the steps required to produce an...Ch. 42 - Prob. 4S
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- Which of the following insulates and protects a neuron’s axon, as well as helps speed along electrical impulses? a. synaptic knobs c. myelin sheath b. receptor sites d. neuromodulatorsarrow_forwardWhich of the following is true about the conduction of action potentials? a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.arrow_forwardWhat part of the membrane composition of a neuron is most important for the permeability of the membrane to various ions? Group of answer choices a. The outside and inside are charged b. There are proteins embedded in the membrane c. There is myelin around some cells d. Its ability to exist in fluid enviornmentarrow_forward
- A neuron must reach threshold to fire an action potential. In this context, threshold refers to which event? a. voltage at which damage occurs to the membrane because of the electrical charge b. the voltage at which potassium ions begin to flow in and out of the cell c. the voltage at which voltage-gated sodium channels open d. the voltage at which the neuron can no longer produce an action potential According to studies in developing rodents, testosterone treatment causes detectable changes in: a. the sex region Y gene b. the thalamus c. the hypothalamus d. alpha-fetoproteinarrow_forwardWhen a neuron is stimulated, sodium moves into the cell, causing the inside of the neuron to __________. a. become less negative relative to the outside b. become more negative relative to the outside c. remain neutral in charge d. become less positive relative to the outsidearrow_forwardWhich part of the neuron likely contains the most vesicles? a. Dendritesb. Cell bodyc. Nucleusd. Axone. Axon Terminal Which part of the neuron has the most voltage-gated calcium channels? a. Dendritesb. Cell bodyc. Nucleusd. Axone. Axon Terminalarrow_forward
- At rest, a neuron has a lower concentration of sodium than the surrounding fluid. When a neuron sends a signal, it opens sodium channels. What happens to the sodium when the sodium channels open? A. The sodium diffuses out of the cell. B. The sodium is pumped into the cell. O C. The sodium is pumped out of the cell. O D. The sodium diffuses into the cell. nswered MacBook Air 20 F3 F5 @ $ % & * 2 6 7 8 W E Rarrow_forwardWhen a neuron is inactive, more of which of the following exist OUTSIDE the neuron? A. Myelin sheaths B. Positive ions C. Neuropeptides D. Negative ionsarrow_forwardDuring an action potential, the inside of the cell membrane becomes more positive than the outside. Why does this happen? a. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the inside more positive. b. During depolarization, the sodium ions rush in and the potassium ions have not begun rushing out, making the outside more positive. c. During depolarization, the potassium ions rush in and the sodium ions have begun rushing out, making the inside more positive. d. During depolarization, the sodium ions rush in and the potassium ions have begun rushing out, making the outside more positive.arrow_forward
- The nerve impulses always travel in one direction from dendrites to axon terminals. What prevents an action potential from travelling backward? a. Hyperpolarization of the neuron makes the membrane more positive and prevents another action potential. b. After repolarization, the refractory period occurs, where the sodium ions are found outside the cell. c. After repolarization, the reversal of ions prevents another action potential as there would not be enough sodium ions outside the cell to rush in. d. The refractory period prevents another action potential by lowering the threshold potential.arrow_forwardThe presence of an electrical gradient is responsible for both the resting membrane potential and the action potential in the neuron.a. In this case who is responsible for maintaining the electric gradient to produce a potential for the resting membrane?b. Explain what is meant by an electrical gradient in the context of a cell (neuron)!arrow_forwardA neuron may receive signals from thousands of synaptic terminals. What determines whether the receiving neuron will respond by transmitting a signal? a. the concentration of transmitter inside the receiving neuron b. the summation of excitatory and inhibitory signals received c. the number of glial cells contact the receiving neuronarrow_forward
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