Which of the following describes the movement of the correct ion in the falling phase of the action potent sodium moves into the cell potassium moves out of the cell potassium moves into the cell O sodium moves out of the cell
Which of the following describes the movement of the correct ion in the falling phase of the action potent sodium moves into the cell potassium moves out of the cell potassium moves into the cell O sodium moves out of the cell
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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### Understanding Ion Movement During Action Potential
#### Question:
Which of the following describes the movement of the correct ion in the falling phase of the action potential?
#### Options:
- ⃝ Sodium moves into the cell
- ⃝ Potassium moves out of the cell
- ⃝ Potassium moves into the cell
- ⃝ Sodium moves out of the cell
#### Explanation:
During the action potential of a neuron, several phases occur which involve the movement of ions across the cell membrane. In the falling phase, or repolarization phase, potassium (K⁺) ions move out of the cell. This movement is essential for returning the cell to its resting membrane potential after the depolarization phase.
**Correct Answer:**
- ⃝ Potassium moves out of the cell
This specific movement helps to reduce the positive charge inside the cell, thereby bringing the membrane potential back down to a negative value, closer to the resting state.
---
This educational content provides insights into the ionic movements essential for understanding the fundamental processes of neuronal action potentials. Such knowledge is pivotal for students studying neuroscience, physiology, and related fields.
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