Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 42.3, Problem 2CS
Summary Introduction
To sketch: The graph showing a change in the potential of a neuron when it simultaneously receives a strong depolarizing and equally strong hyperpolarizing stimulus or a strong depolarizing and a weak hyperpolarizing stimulus.
Introduction: Nerves carry the messages from the central nervous system to the muscles and other organs. The messages are carried by the nerves in the form of electrical impulses. The signals that reach the cell body stimulate the neuron to generate its own signal in the form of the action potential and relay it to the next neuron or the effector organs. Na+ and K+ play a significant role in the development of the action potential across the membrane.
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Subject: Neurophysiology
The neuron for this experiment is in a bath with [K+] = 2 mM and [Na+] = 150 mM.
Calculate the Nernst Equilibrium potential for each ion.
What is your estimate for the gNa and for gK? If you are more comfortable, use PNa and PK. Remember, these values should be between 0 and 1.
What is the resting membrane potential for this cell?
Draw an action potential for this neuron in this solution. Keep in mind that this neuron is in unusual solutions. Label each axis and indicate inward and outward currents. Be absolutely certain to label the peak voltage and threshold for the AP!
Summarize neuron communication from the moment of receptor stimulation to the response of an effector, such as a muscle fiber, and define neurotransmitter, resting membrane potential, and current.
Define electrochemical gradients and the term “polarized”, and describe the electrochemical basis of the resting membrane potential including the function of the sodium-potassium pump in maintaining the resting membrane potential.
Describe graded potentials including hyperpolarizing and depolarizing graded potentials.
Describe action potentials (nerve impulses) including:
Thresholds
All-or-none principle
Phases of action potential generation
Refractory period
Q:Let w= 4,p= 2 and b =-2 with f radial basis, what is the single neuron output?
f=e(-n²) =e-(4*2+(-2))²=e-(6)²= 2.31952E-16
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Chapter 42 Solutions
Biology
Ch. 42.1 - Prob. 1CCCh. 42.2 - Prob. 1CSCh. 42.3 - Prob. 1CSCh. 42.3 - Prob. 2CSCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.4 - What key prior observation led Loewi to develop...Ch. 42.4 - CoreSKILL The results of Loewis experiment...Ch. 42.4 - Prob. 3EQCh. 42 - Prob. 1TY
Ch. 42 - Prob. 2TYCh. 42 - The myelin sheath a. is produced by neurons in the...Ch. 42 - Prob. 4TYCh. 42 - Prob. 5TYCh. 42 - Which of the following contribute(s) to the...Ch. 42 - Prob. 7TYCh. 42 - Prob. 8TYCh. 42 - Prob. 9TYCh. 42 - Prob. 10TYCh. 42 - Prob. 1CQCh. 42 - Prob. 2CQCh. 42 - Prob. 3CQCh. 42 - Describe the difference between an electrical...Ch. 42 - Prob. 2COQ
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