Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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**Sodium and Potassium Ion Movement in Neurons**

Imagine that a neuron has 5X higher sodium outside than inside and 10X higher potassium inside than outside.

**Question**:
Which direction do you predict the ions to move just based off of concentration gradient?

**Options**:
- O both ions will move into the cell
- O both ions will move out of the cell
- O sodium will move in and potassium will move out
- O sodium will move out and potassium will move in

Explanation:
Based on the concentration gradient, typically, ions move from areas of high concentration to areas of low concentration. Therefore, in the given scenario:
- Sodium, which is higher outside the neuron, will tend to move into the cell.
- Potassium, which is higher inside the neuron, will tend to move out of the cell.

Hence, the correct answer should be:
- O sodium will move in and potassium will move out

This movement is essential for maintaining the electrochemical gradient crucial for various cellular functions, including the propagation of action potentials in neurons.
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Transcribed Image Text:**Sodium and Potassium Ion Movement in Neurons** Imagine that a neuron has 5X higher sodium outside than inside and 10X higher potassium inside than outside. **Question**: Which direction do you predict the ions to move just based off of concentration gradient? **Options**: - O both ions will move into the cell - O both ions will move out of the cell - O sodium will move in and potassium will move out - O sodium will move out and potassium will move in Explanation: Based on the concentration gradient, typically, ions move from areas of high concentration to areas of low concentration. Therefore, in the given scenario: - Sodium, which is higher outside the neuron, will tend to move into the cell. - Potassium, which is higher inside the neuron, will tend to move out of the cell. Hence, the correct answer should be: - O sodium will move in and potassium will move out This movement is essential for maintaining the electrochemical gradient crucial for various cellular functions, including the propagation of action potentials in neurons.
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