Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 39, Problem 2ITD
Summary Introduction
To review:
Reviewing the effects of injecting broken down ATP (components of ATP) into the squid axon that is already in cyanide solution.
Introduction:
Action potential generated in the neuron due to the inflow of sodium ions into the axon through sodium ion transporters, and results into excitation of the neuron. These transporters maintain the sodium concentration inside the axon and do not let sodium ions get out of the axon. The sodium transporters get inactivated in the presence of cyanide, and sodium present inside the axon gets out from the neuron.
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The giant squid axon has a diameter = 1mm and 1 = 13mm. Compared to a mammalian neuron with a diameter = 1 um and ^ = 0.2mm, which of the following is correct?
graded potentials can generate action potentials in the mammalian axon but not in the squid axon.
graded potential of similar magnitude would result in action potentials with larger amplitude in the mammalian axon
graded potentials of similar magnitude would result in action potentials with larger amplitude in the squid axon
graded potentials of similar magnitude would travel furthest from their point of origin in the mammalian axon
graded potentials of similar magnitude would travel furthest from their point of origin in the squid axon
Three currents are produced by a 56 mV depolarization leading to an action
potential in a squid axon membrane during a voltage clamp experiment as
shown. What is the mechanism underlying the capacitive current?
56 mV Depolarization
Capacitative
current
Late current
Early current
Time (ms)
Opening of Na* channels
Current due to the Na/K*
pump
O Neutralization of the charge on the membrane
Opening of K channels
Membrane
Membeane
current imA/cm potential (mV)
Consider a typical mammalian neuron with all of the appropriate membrane
channels. If you know that neuron is at rest, at a temperature of 37°C and you
know the intracellular and extracellular concentration of the potassium,
which of the following statements is most likely to be true?
a. The equilibrium potential of potassium would be negative if the
concentration of potassium is higher on the inside.
b. The equilibrium potential of potassium would be positive if the
concentration of potassium is higher on the inside
c. The equilibrium potential of potassium cannot be calculated because
the Nernst equation requires that you know the concentration of all
ions
d. The equilibrium potential of potassium be zero if the concentration of
potassium is higher on the outside
e. None of the above
Chapter 39 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 39.1 - Prob. 1SBCh. 39.1 - Prob. 2SBCh. 39.1 - Prob. 3SBCh. 39.2 - Prob. 1SBCh. 39.2 - Prob. 2SBCh. 39.3 - Prob. 1SBCh. 39.3 - Prob. 2SBCh. 39.4 - Prob. 1SBCh. 39 - Prob. 1TYKCh. 39 - Prob. 2TYK
Ch. 39 - An example of a synapse could be the site where:...Ch. 39 - Prob. 4TYKCh. 39 - The major role of the Na+/K+ pump is to: a. cause...Ch. 39 - In the propagation of a nerve impulse: a. the...Ch. 39 - Which of the following does not contribute to...Ch. 39 - Which of the following statements best describes...Ch. 39 - Prob. 9TYKCh. 39 - Prob. 10TYKCh. 39 - Prob. 11TYKCh. 39 - Prob. 12TYKCh. 39 - Prob. 13TYKCh. 39 - Prob. 14TYKCh. 39 - Prob. 15TYKCh. 39 - Prob. 16TYKCh. 39 - You learned in this chapter that Na+/K+ active...Ch. 39 - Prob. 2ITDCh. 39 - Prob. 3ITD
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