Human Physiology: An Integrated Approach (8th Edition)
8th Edition
ISBN: 9780134605197
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Textbook Question
Chapter 6.1, Problem 2CC
Which signal molecules listed in the previous question are transported through the circulatory system? Which are released by neurons?
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Conotoxin is produced by marine cone snails. Among its effects is to block
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The phases and ionic basis of an action potential.
Membrane potential (mv)
+30
-55
-70
Na*
channels
open
+
K
Action potential
-Pha
channels
open
.PK
Time (msec)
(b) Permeability changes for Na* and
K* during an action potential
Membrane permeability (P)
Chapter 6 Solutions
Human Physiology: An Integrated Approach (8th Edition)
Ch. 6.1 - Match the communication method on the left with...Ch. 6.1 - Which signal molecules listed in the previous...Ch. 6.1 - A cat sees a mouse and pounces on it. Do you think...Ch. 6.2 - List four components of signal pathways.Ch. 6.2 - Prob. 5CCCh. 6.2 - What are the four steps of signal transduction?Ch. 6.2 - Prob. 7CCCh. 6.2 - Prob. 8CCCh. 6.2 - Name the four categories of membrane receptors.Ch. 6.2 - Prob. 10CC
Ch. 6.2 - Prob. 11CCCh. 6.2 - Prob. 12CCCh. 6.3 - The extracellular fluid Ca2+ concentration...Ch. 6.3 - Prob. 14CCCh. 6.4 - What do receptors, enzymes, and transporters have...Ch. 6.4 - Prob. 16CCCh. 6.4 - Prob. 17CCCh. 6.5 - What is the difference between tonic control and...Ch. 6.5 - Prob. 19CCCh. 6.5 - What is the difference between local control and...Ch. 6.5 - Name the seven steps in a reflex control pathway...Ch. 6.5 - Prob. 22CCCh. 6.5 - Prob. 23CCCh. 6.5 - Prob. 24CCCh. 6 - What are the two routes for long-distance signal...Ch. 6 - Prob. 2RQCh. 6 - Prob. 3RQCh. 6 - Prob. 4RQCh. 6 - Prob. 5RQCh. 6 - An enzyme known as protein kinase adds the...Ch. 6 - Distinguish between central and peripheral...Ch. 6 - Prob. 8RQCh. 6 - Prob. 9RQCh. 6 - Prob. 10RQCh. 6 - Prob. 11RQCh. 6 - Explain the relationships of the terms in each of...Ch. 6 - List and compare the four classes of membrane...Ch. 6 - Prob. 14RQCh. 6 - Prob. 15RQCh. 6 - Prob. 16RQCh. 6 - Prob. 17RQCh. 6 - Identify the target tissue or organ for each...Ch. 6 - Now identify the integrating center for examples...Ch. 6 - In each of the following situations, identify the...Ch. 6 - Prob. 21RQCh. 6 - Prob. 22RQ
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- Name four ways in which the adrenaline signal to the heart is terminated.?arrow_forwardWhat is the function of the sodium-potassium pump during the nerve impulse transmission? Which is the ratio of Na-K with inside/outside the cell?arrow_forwardChoose the correct answer: A) When the voltage gated K+ channels open K+ moves down its concentration gradient from the ECF to inside the cell. O B) The value for resting membrane potential is closer to the EK+ (Equilibrium potential for K+) than the ENa+ O C) When the membrane potential is at rest the membrane is more permeable to Na+ than it is to K+ O D) Closing of the voltage-gated Na+ channels increases the permeability of the membrane to Na+arrow_forward
- In the recording below, a neuron was bathed in a saline solution containing a pharmacologicalagent that altered the membrane currents being recorded. a) What ionic current is being recorded in these data? b) What pharmacological agent was likely used in this study and what did it do? c) Is the recorded ionic current transient or sustained and why?d) What is the role of this ionic current in the production of a neuronal action potential?arrow_forwardWhat is the difference between a ligand-gated channel (like H1 or the AChR) and a voltage gated channel?arrow_forwardtaw a graph representing the changes in membrane potential across the axonal membrane before, during, and after an action potential, On your graph, use a highlighter to clearly indicate for which portions of your graph the letter corresponding to each cellular event listed below belongs. List of cellular events: A) All K* channels open B) All Nat channels close C) The Na*/K* ATPase cotransporter transports Nat and K* across the membrane. D) All Na* channels open E) The threshold value of membrane potential is attained. F) All K* channels close G) Some Nat channels open Your graph: o pe cffectonarrow_forward
- Please answer 3) Which of the following keeps the impulse traveling in one direction down the axon? a) inactivation of voltage-gated Na+ channels b) the nodes of Ranvier c) the magnitude of the action potential (+30 mV) d) the myelin sheatharrow_forwardWhich statement is true regarding the action potential process? 1) the repolarization phase must occur prior to depolarization 2) hyperpolarization allows for Na+ and K+ ions to move into and out of the cell 3) the action potential process only occurs at the nodes of ranvier in myelinated axons 4) depolarization occurs because voltage gated K+ channels allow K+ ions to rush into the cellarrow_forwardPlease answer both 1) What is responsible for returning the cell to its normal resting membrane potential following the absolute refractory period? a) K+ leak channels b) the Na+/K+ pump c) activation of voltage-gated Na+ channels d) a ligand binding to a ligand-gated Na+ channel 2) What property of an action potential allows it to propagate? a) the rapid period of depolarization b) the rapid period of repolarization c) the brief period of hyperpolarization d) the fact that the peak is 85 mV above thresholdarrow_forward
- a) Explain in detail what is occurring at stage A in the graph. (Be specific in terms of what's happening to the ion channels in your explanation if necessary!) b) What does this graph represent as a whole? Explain the main idea it portrays. +40| -70- A 1 2 4 Time/ms Potential Difference/mV Barrow_forward13) Draw a graph representing the changes in membrane potential across the axonal membrane before, during, and after an action potential. On your graph, use a highlighter to clearly indicate for which portions of your graph the letter corresponding to each cellular event listed below belongs. List of cellular events: A) All K* channels open B) All Na* channels close C) The Na*/K* ATPase cotransporter transports Na* and K* across the membrane. D) All Na* channels open E) The threshold value of membrane potential is attained. F) All K* channels close G) Some Na* channels open Your graph:arrow_forwardHow is the low voltage-activated potassium channel (LVA) activated? What is the role of this channel in an action potential?arrow_forward
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