Which number is identifying the phase which occurs between -55mV and +30mV?
Which number is identifying the phase which occurs between -55mV and +30mV?
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
Transcribed Image Text:**Which number is identifying the phase which occurs between -55mV and +30mV?**
**Diagram Explanation:**
The image contains a graph with labeled phases, numbered from 1 to 5. The graph represents the changes in membrane potential during an action potential.
1. **Phase 1**: Resting potential before the threshold is reached.
2. **Phase 2**: Depolarization phase, where the membrane potential becomes more positive.
3. **Phase 3**: Peak of the action potential around +30mV.
4. **Phase 4**: Repolarization phase, where the membrane potential returns toward the resting potential.
5. **Phase 5**: Hyperpolarization, where the membrane potential becomes slightly more negative than the resting potential.
**Multiple Choice Options:**
- ○ 1
- ○ 2
- ○ 3
- ○ 4
- ○ 5
**Correct Answer Explanation:**
The phase between -55mV and +30mV typically refers to the depolarization phase, which is indicated by Phase 2 on the graph.
Expert Solution
Step 1
The nervous system establishes its function by the means of neurons or nerve cells that aid in the transport of information in the form of electric signals. These signals are transported through the nerve cells by the means of potential differences. Action potentials are a type of potential differences that are identified because of their unique nature of electrical impulse transmission across a muscle cell or nerve cell.
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