In the axon model of Figure 23.50, if the thickness of the myelin sheath were increased, the
Question:
In the axon model of Figure 23.50, if the thickness of the myelin sheath were increased, the propagation speed of nerve impulses would A. Increase. B. Decrease. C. Remain the same.
Transcribed Image Text:
FIGURE 23.50 A circuit model of nerve-impulse propagation along myelinated axons. (a) An electrical model of a myelinated axon The ion channels are located at the nodes. When they are triggered, the potential at the node changes rapidly to +40 mV. Thus this section of the axon acts like a battery with a switch.. Myelin sheath rig Conducting fluid The myelin sheath acts like the dielectric of a capacitor C between the conducting fluids inside and outside the axon. (b) Signal propagation in the myelinated axon 1. An action potential is triggered at this node; we close the switch. ww 2. Once the switch is closed, the action potential emf drives a current down the axon and charges the capacitance of the membrane. www Ion channels ww 20 H The conducting fluid within the axon acts like a resistor R. 3. When the voltage on the capacitor exceeds a threshold, it triggers an action potential at this node the next switch is closed.
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Related Book For
College Physics A Strategic Approach
ISBN: 9780321907240
3rd Edition
Authors: Randall D. Knight, Brian Jones, Stuart Field
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