Anatomy & Physiology
5th Edition
ISBN: 9780321861580
Author: Marieb, Elaine N.
Publisher: Pearson College Div
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Textbook Question
Chapter 11, Problem 18RQ
Describe the events that must occur to generate an AP. Relate the sequence of changes in permeability to changes in the ion channels, and explain why the AP is an all-or-none phenomenon.
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B. If the permeability of the membrane to K+, Na+, and Cl- are 100, 3, and 10
respectively, what is the resting membrane potential of this cell?
USE CHK to got:
Describe the role of the potassium leak channel and the sodium- potassium pump in resting membranme potential.
Background: You are working with a patient who has trouble getting rid of Potassium (K). Normally, the kidneys remove excess potassium from the extra cellular fluid, but in this case, kidney failure have impaired that function.
Questions:
Describewhat role potassium plays in healthy, normal excitable cells. First, describe what potassium does to create the resting membrane potential of muscle and nervous cells. Include specifics of how potassium contributes to an excitable cell’s resting membrane potential. Second, describe the role potassium would play during an action potential. Again, include specifics of how potassium plays its part during an action potential.
Chapter 11 Solutions
Anatomy & Physiology
Ch. 11 - What is meant by integration, and does it...Ch. 11 - Which subdivision of the PNS is involved in (a)...Ch. 11 - Which type of neuroglia controls the extracellular...Ch. 11 - Which two types of neuroglia form insulating...Ch. 11 - MAKING CONNECTIONS Which part of the neuron is its...Ch. 11 - How does a nucleus within the brain differ from a...Ch. 11 - How is a myelin sheath formed in the CNS, and what...Ch. 11 - Which structural and functional type of neuron is...Ch. 11 - For an open channel, what factors determine in...Ch. 11 - For which cation is there the greatest amount of...
Ch. 11 - Which is bigger, a graded potential or an action...Ch. 11 - An action potential does not get smaller as it...Ch. 11 - Why does a myelinated axon conduct action...Ch. 11 - If an axon receives two stimuli close together in...Ch. 11 - What structure joins two neurons at an electrical...Ch. 11 - Events at a chemical synapse usually involve...Ch. 11 - Which ions flow through chemically gated channels...Ch. 11 - Prob. 18CYUCh. 11 - Prob. 19CYUCh. 11 - Why is cyclic AMP called a second messenger?Ch. 11 - Which types of neural circuits would give a...Ch. 11 - Prob. 22CYUCh. 11 - What pattern of neural processing occurs when we...Ch. 11 - Which of the following structures is not part of...Ch. 11 - Match the names of the supporting cells found in...Ch. 11 - Prob. 3RQCh. 11 - Assume that an EPSP is being generated on the...Ch. 11 - The velocity of nerve impulse conduction is...Ch. 11 - Chemical synapses are characterized by all of the...Ch. 11 - Biogenic amine neurotransmitters include all but...Ch. 11 - Prob. 8RQCh. 11 - Inhibition of acetylcholinesterase by poisoning...Ch. 11 - Prob. 10RQCh. 11 - An IPSP is inhibitory because (a) it...Ch. 11 - Identify the neuronal circuits described by...Ch. 11 - Explain both the anatomical and functional...Ch. 11 - (a) Describe the composition and function of the...Ch. 11 - (a) What is myelin? (b) How does the myelination...Ch. 11 - (a) Contrast unipolar, bipolar, and multipolar...Ch. 11 - What is the polarized membrane state? How is it...Ch. 11 - Describe the events that must occur to generate an...Ch. 11 - Prob. 19RQCh. 11 - (a) Explain the difference between an EPSP and an...Ch. 11 - Since at any moment a neuron is likely to have...Ch. 11 - The effects of neurotransmitter binding are very...Ch. 11 - Prob. 23RQCh. 11 - Prob. 24RQCh. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...Ch. 11 - Elaine Sawyer, 35, was on her way to the local...
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- Predict the effect of a reduced extracellular concentration of Na+ on themagnitude of the action potential in an electrically excitable cell.arrow_forwardexplain the mechanism of vesicular trafficarrow_forwardDescribe the action potential in terms of the different functional states of the voltage- gated Na+ membrane channels (Note: there are three states)arrow_forward
- Mark 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_forwardExplain A Miniglossary of Terms Describing the Membrane Potentialarrow_forwardNarrate the action potential from start to finish. Be sure to include and define the following terms: threshold, rising phase, falling phase, refractory period, exocytosis.arrow_forward
- Construct a personalized flow chart and show the summary of the events involved for the propagation of action potential along the neuron. Highlight the role being played by ions.arrow_forwardMatch the stages of action potential with the appropriate image or description. 1. Resting membrane potential 2. Threshold 3. Depolarization 4. Repolarization 5. Hyperpolarization 6. Refractory period The potential difference that must be met in order for an action potential to be generated When the potential drops below resting level When the potential starts to decrease again after it has reached a maximum Occurs at -77 mV When the membrane is resetting and an action potential cannot yet be produced again When the sodium channels are open Occurs at -55 mVarrow_forwardContrast the somatic and autonomic divisions of the efferentnervous system; mention at least three characteristics of each?arrow_forward
- Explain both question with proper explanation with step by step answer.arrow_forwardExplain the contribution of the Na+/K+ pump activity to the genesis and maintenance of the resting membrane potential and indicate which category of membrane transport the Na+/K+ pump belongs toarrow_forwardState the functions of efferent neurons.arrow_forward
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