교과서 질문
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The concentration of Na+ is highest in the cytosol, and the concentration of K+ is highest in the extracellular fluid.
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11. Nervous Tissue and Nervous System
Ions - Sodium and Potassium
Multiple Choice
Which of the following describes the function of the sodium-potassium pump in cellular physiology?
A
It transports sodium and potassium ions in equal amounts across the cell membrane without using ATP.
B
It transports two sodium ions into the cell and three potassium ions out of the cell, using ATP.
C
It transports three sodium ions out of the cell and two potassium ions into the cell, using ATP.
D
It allows sodium and potassium ions to passively diffuse across the cell membrane.
검증된 단계별 안내1
Understand the role of the sodium-potassium pump: It is a type of active transport mechanism found in the cell membrane that helps maintain the electrochemical gradient across the membrane.
Recognize that the pump uses ATP to function, indicating that it is an active transport process rather than passive diffusion.
Identify the specific ions involved: The pump transports sodium (Na⁺) and potassium (K⁺) ions.
Clarify the direction of ion movement: The pump moves three sodium ions out of the cell and two potassium ions into the cell.
Note the importance of this process: By maintaining the concentration gradients of sodium and potassium, the pump plays a crucial role in nerve impulse transmission and muscle contraction.
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