Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Question
A. I
b. II
C. IV
D. I & II
E. II & III
F. I & IV
G. III & IV
H. II & IV
Transcribed Image Text:**Which arrow best represents the point where the voltage-gated sodium channels are inactivated?**
*An action potential*
This graph depicts the stages of an action potential, illustrating changes in membrane potential (in millivolts) over time (in milliseconds).
- **Rising Phase (I):** The initial upward curve, indicating rapid depolarization due to the opening of voltage-gated sodium channels.
- **Overshoot:** The peak of the graph, where the inside of the neuron is momentarily more positive than the outside.
- **Falling Phase (III):** The downward slope following the peak, representing repolarization as sodium channels inactivate and potassium channels open.
- **Undershoot:** The brief dip below the resting potential, also known as hyperpolarization, due to the continued outflow of potassium ions.
- **Resting Potential and Voltage Threshold:** The horizontal dashed lines indicate the typical resting membrane potential and the threshold potential required to trigger an action potential.
- **Arrow II and IV:** These arrows mark the phases relative to depolarization and repolarization, with Arrow IV indicating the undershoot phase where the potential returns to resting levels.
The point where voltage-gated sodium channels are inactivated is best represented by Arrow III during the falling phase.
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