BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 29, Problem 3SA
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 |
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
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
An 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 operating
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 channels
Chapter 29 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 29 - ______ relay messages from the brain and spinal...Ch. 29 - Prob. 2SACh. 29 - Action potentials occur when ______. a. potassium...Ch. 29 - Neurotransmitters are released by _______. a. axon...Ch. 29 - Prob. 5SACh. 29 - Prob. 6SACh. 29 - Prob. 7SACh. 29 - Prob. 8SACh. 29 - Prob. 9SACh. 29 - Prob. 10SA
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.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 membranearrow_forwardDuring 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 hyperpolarizationarrow_forwardPlease answer question 2arrow_forward
- 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 abovearrow_forwardThe 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.arrow_forwardMark the following statements as true or false. If a statement is false, correct it to make a true statement. a. The resting membrane potential refers to the voltage difference across the membranes of excitable cells at rest. b. The concentration of Na+ is highest in the cytosol, and the concentration of K+ is highest in the extracellular fluid. c. The Na+>K+ pumps and gated channels maintain the Na+ and K+ gradients necessary for action potentials to occur. d. A depolarization is a change in membrane potential that makes the potential less negative. e. A local potential is a change in membrane potential that conducts the long-distance signals of the nervous systemarrow_forward
- Voltage-gated Na+ channels open upon reaching what state? a. resting potential b. threshold c. repolarization d. overshootarrow_forwardWhich one is correct about the AP conduction velocity of nerve fiber A. Increase of the temperature within physiological limit will increase the conduction velocity. B. The fiber with big diameter always conducts faster. C. The increase of extracellular K+ will increase the conduction velocity D. Myelination of nerve fiber always decreases the conduction velocity. E. Anesthesia do not influence the conduction velocity.arrow_forwardThe 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 potentialarrow_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_forwardThe input region lacks _________________, but contains _____________________, Group of answer choices A. Ligand-gated channels, voltage gated channels B. K+ leak channels, voltage gated channels C. Voltage-gated channels, ligand gated channels D. Ligand-gated channels, K+ leak channelsarrow_forwardAction potentials are normally initiated at the axon hillock because a. there is a particularly high density of voltage-gated sodium channels there. b. threshold potential is lower there than at other sites along the plasma membrane. c. activation of sodium channels at the axon hillock results in a particularly strong inward current and consequent depolarization. d. all of these. e. none of these.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license