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A resting cell's membrane is more permeable to K+ simply because: K has a higher atomic number than Na. The Na+/K+ ATPase only works in response to a stimulus. There are more voltage-gated K+ channels than voltage-gated Na+ channels in the cell membrane. There are more K+ leaky channels than Na+ leaky channels in the cell membrane.

A resting cell's membrane is more permeable to K+ simply because: K has a higher atomic number than Na. The Na+/K+ ATPase only works in response to a stimulus. There are more voltage-gated K+ channels than voltage-gated Na+ channels in the cell membrane. There are more K+ leaky channels than Na+ leaky channels in the cell membrane.

Human Anatomy & Physiology (11th Edition)
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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A resting cell's membrane is more permeable to K+ simply because: - ○ K has a higher atomic number than Na. - ○ The Na+/K+ ATPase only works in response to a stimulus. - ○ There are more voltage-gated K+ channels than voltage-gated Na+ channels in the cell membrane. - ● There are more K+ leaky channels than Na+ leaky channels in the cell membrane. The option with the filled circle (●) indicates the correct answer: "There are more K+ leaky channels than Na+ leaky channels in the cell membrane."
Transcribed Image Text:A resting cell's membrane is more permeable to K+ simply because: - ○ K has a higher atomic number than Na. - ○ The Na+/K+ ATPase only works in response to a stimulus. - ○ There are more voltage-gated K+ channels than voltage-gated Na+ channels in the cell membrane. - ● There are more K+ leaky channels than Na+ leaky channels in the cell membrane. The option with the filled circle (●) indicates the correct answer: "There are more K+ leaky channels than Na+ leaky channels in the cell membrane."
**Understanding Ion Movement Across Cell Membranes** Ions, being electrically charged substances, move across the cell membrane according to an electrochemical gradient. This gradient considers both the ion's concentration gradient and the electrical charge distribution across the cell membrane, also known as membrane potential. **Sodium Ions (Na⁺) and Resting Cells** Sodium ions (Na⁺) moving into a resting cell move down their electrochemical gradient based on the following factors: - **Na⁺ ions are in lower concentration inside the cell.** (Checked) - Na⁺ ions are in higher concentration inside the cell. - **The electrical charge distribution is more negative on the inside of the cell membrane.** (Checked) - The electrical charge distribution is more positive on the inside of the cell membrane. This understanding helps in studying how cells maintain their resting potential and respond to signals.
Transcribed Image Text:**Understanding Ion Movement Across Cell Membranes** Ions, being electrically charged substances, move across the cell membrane according to an electrochemical gradient. This gradient considers both the ion's concentration gradient and the electrical charge distribution across the cell membrane, also known as membrane potential. **Sodium Ions (Na⁺) and Resting Cells** Sodium ions (Na⁺) moving into a resting cell move down their electrochemical gradient based on the following factors: - **Na⁺ ions are in lower concentration inside the cell.** (Checked) - Na⁺ ions are in higher concentration inside the cell. - **The electrical charge distribution is more negative on the inside of the cell membrane.** (Checked) - The electrical charge distribution is more positive on the inside of the cell membrane. This understanding helps in studying how cells maintain their resting potential and respond to signals.
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