BIOLOGY: CONCEPTS&INVEST. (LL)
5th Edition
ISBN: 9781264706983
Author: Hoefnagels
Publisher: MCG
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Textbook Question
Chapter 26, Problem 5WIO
What is the connection between the threshold potential and an action potential? What happens to sodium and potassium ions as the membrane is depolarized and repolarized? How does the membrane restore its resting potential?
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Chapter 26 Solutions
BIOLOGY: CONCEPTS&INVEST. (LL)
Ch. 26.1 - Prob. 1MCCh. 26.1 - Prob. 2MCCh. 26.1 - Prob. 3MCCh. 26.2 - Prob. 1MCCh. 26.2 - Where is the myelin sheath located?Ch. 26.2 - Prob. 3MCCh. 26.2 - What are the functions of each of the three...Ch. 26.3 - Describe the forces that maintain the distribution...Ch. 26.3 - Prob. 2MCCh. 26.3 - Prob. 3MC
Ch. 26.3 - Prob. 4MCCh. 26.3 - What prevents action potentials from spreading in...Ch. 26.3 - Prob. 6MCCh. 26.3 - How do myelin and the nodes of Ranvier speed...Ch. 26.4 - Describe the structure of a synapse.Ch. 26.4 - Prob. 2MCCh. 26.4 - Prob. 3MCCh. 26.4 - Prob. 4MCCh. 26.5 - Prob. 1MCCh. 26.5 - Prob. 2MCCh. 26.5 - Prob. 3MCCh. 26.5 - Prob. 4MCCh. 26.6 - Prob. 1MCCh. 26.6 - Prob. 2MCCh. 26.6 - Prob. 3MCCh. 26.6 - List some structures that protect the central...Ch. 26.6 - Prob. 5MCCh. 26.7 - The researchers conducted a behavioral experiment...Ch. 26.7 - Prob. 2MCCh. 26 - Some cells of the central nervous system are...Ch. 26 - Prob. 2MCQCh. 26 - What event triggers an action potential? a....Ch. 26 - Prob. 4MCQCh. 26 - Prob. 5MCQCh. 26 - Prob. 6MCQCh. 26 - Prob. 7MCQCh. 26 - Damage to the surface tissue of the spinal cord...Ch. 26 - Prob. 9MCQCh. 26 - Describe some invertebrate nervous systems. Why do...Ch. 26 - Prob. 2WIOCh. 26 - Prob. 3WIOCh. 26 - Prob. 4WIOCh. 26 - What is the connection between the threshold...Ch. 26 - Write a nonbiological analogy for resting...Ch. 26 - Prob. 7WIOCh. 26 - Sketch a synapse: label the axon and synaptic...Ch. 26 - Describe the events that occur at a synapse when a...Ch. 26 - Prob. 10WIOCh. 26 - Prob. 11WIOCh. 26 - Cerebral palsy is a nervous system disorder that...Ch. 26 - Traumatic brain injury can occur when a person...Ch. 26 - Prob. 14WIOCh. 26 - Prob. 15WIOCh. 26 - Prob. 16WIOCh. 26 - Prob. 1PITCh. 26 - Prob. 2PITCh. 26 - PULL IT TOGETHER 4. Acid the somatic, autonomic,...
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- What ion is the major influence on the resting membrane potential? Explain its role.arrow_forwardWhat is resting membrane potential close to and why?arrow_forwardMatch each type of membrane potential (resting, threshold, graded, or action) to its definition: a) The membrane potential at which voltage gated sodium channels open. b) The membrane potential that triggers the action potential. c) Change in membrane potential that may or may not reach threshold and that may be depolarizing or hyperpolarizing. d) Rapid, strong depolarization followed by immediate repolarization. This potential is self-renewing if the right ion channels are nearby.arrow_forward
- What is the role of ions, the phospholipid bilayer, and plasma membrane channels in neurons relative to the concepts of current, voltage, and resistance?arrow_forwardWhat is the role of maximal potassium conductance in the generation and propagation of action potential?arrow_forwardWhat properties of ion channels allow them to generate the large, rapid changes in membrane potential?arrow_forward
- What is a graded potential? Where does a graded potential start in a neuron? Do graded potentials always result in an action potential? Are all graded potentials depolarizing? Why or why not? Where are action potentials started in a neuron and what is the threshold potential to do so in a neuron?arrow_forwardWhat factors promote change in Vm (membrane potential) during an action potential?arrow_forwardWhat is the resting membrane potential, and what is responsible for generating it?arrow_forward
- In the figure to the left, name the 4 phases of the action potential (Note: you have to write in where phase 4 occurs). Describe what happens in each phase with a focus on Na+ and K+ flow through channels and the membrane potential. Discuss the importance of threshold. How does this relate to the concept of APs being all or none?arrow_forwardIf: membrane potential=-70mV, ENa=+60mV, and Ex=-90mV, consider which directions Na+ and K+ will leak across the membrane. If both ions are crossing the membrane, what is the most important factor in determining whether membrane potential will become more positive or more negative?arrow_forwardWhat condition is required for a specific ion to contribute to resting membrane potential?arrow_forward
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