Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 13, Problem 5SQ
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
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Students have asked these similar questions
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
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 the following statements about membrane ion channels is incorrect?
a. mechanically gated channels respond to physical deformation
b. ligand-gated channels respond to neurotransmitters
c. voltage-gated channels respond to changes in membrane potential
d. leakage channels have gates and are always open
e. none of the above
Chapter 13 Solutions
Human Biology Custom Edition
Ch. 13 - Explain the difference between a sensory neuron,...Ch. 13 - What are the functional zones of a motor neuron?Ch. 13 - Define an action potential.Ch. 13 - What is a synapse? Explain the difference between...Ch. 13 - Explain what happens during synaptic integration.Ch. 13 - Prob. 6RQCh. 13 - Prob. 7RQCh. 13 - The nervous system senses, interprets, and issues...Ch. 13 - A neuron responds to adequate stimulation with...Ch. 13 - When action potentials arrive at a synapse between...
Ch. 13 - In the simplest kind of reflex______, directly...Ch. 13 - The accelerating flow of _______ ions through...Ch. 13 - Prob. 6SQCh. 13 - Prob. 7SQCh. 13 - Cerebrospinal fluid _____. a. fills cavities and...Ch. 13 - Match each region of the central nervous system...Ch. 13 - Prob. 1CTCh. 13 - In newborns and premature babies, the bloodbrain...Ch. 13 - Prob. 3CT
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- Neurotransmitters are released from neurons due to the opening of ____________. Select one: a. voltage gated Na channels b. voltage gated K channels c. voltage gated Ca channles d. voltage gated Cl channels e. voltage gated proton channelsarrow_forwardThe most important diffusible ion in the establishment of the membrane potential is a. K+. b. Na+. c. Ca2+. d. Cl−.arrow_forwardWhich of the following would most likely suppress an action potential in neurons? Select one: a. increased amount of ATP b. movement of chlorine down its concentration gradient c. active transport of chlorine d. opening of sodium channels e. closing calcium channels Clear my choicearrow_forward
- Which of the following molecules is not involved in the maintenance of the resting membrane potential? a. potassium cations b. ATP c. voltage-gated ion channels d. calcium cationsarrow_forwardWhen an action potential arrives in an axon terminal, synaptic vesicles containing acetylcholine are released by: a. facilitated diffusion. b. osmosis. c. exocytosis. d. endocytosis.arrow_forwardWhich of the following means the ability to transmit electrical current from one cell to another? A. Conductivity B. Excitability C. Contractility D. Automaticityarrow_forward
- Voltage-gated Na+ channels are.... (select all that apply). Group of answer choices: A. Opened by the presence of negative charge B. Opened by the presence of positive charge C. Always open D. Gatedarrow_forwardA. the fact that one represents a depolarization and the other represents a hyperpolarization. B. the capacitive properties of the membrane. C. the difference in applied voltage.arrow_forwardAn action potential begins when______ . a. a neuron reaches threshold potential b. voltage-gated potassium gates open c. voltage-gated sodium gates close d. sodium–potassium pumps stop operatingarrow_forward
- A local potential will only lead to an action potential if is reached O a. depolarization b. resting membrane potential c. hyperpolarization d. thresholdarrow_forwardwhich of the following statements is false with regard to cell electrical impulses? a. an impulse begins when chloride ions are allowed to rush inside the cell b. depolarization is when the relative charges across the membrane have switched due to ions crossing the membrane c. repolarization refers only to the relative charges across the membrane being restored, even when the ion balance is not returned to normal yet d. ionic balance is brought back to resting potential by the sodium-potassium pumpsarrow_forwardIf the permeability of the plasma membrane to K+ increases, the restingmembrane potential difference . This is called.a. increases, hyperpolarization c. decreases, hyperpolarizationb. increases, depolarization d. decreases, depolarizationarrow_forward
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