In the normally functioning cell, Na+ is moved out of the cell against a concentration gradient. Which of the following statements is correct about this process?

Question

In the normally functioning cell, Na+ is moved out of the cell against a concentration gradient.  Which of the following statements is correct about this process?

BlackTom AI · Accepted Answer

Analyzing the described scenario where Na+ is moved out of the cell against its concentration gradient prompts us to assess the energy requirement and transport mechanism.

Option 1: It creates a shortage of water and causes hyponatremia. This statement confuses cellular ion transport with clinical electrolyte disorders; while hyponatremia involves low extracellular sodium, the described pump activity is about moving Na+ against its gradient using energy, not about water shortage effects. Therefore this option mischaracterizes the process.

Option 2: It does not require energy and is called diffusion. Diffusion is the passive movement down a gradient that requires no energy input, and Na+ moving against its gradient cannot be diffusion. This option incorrectly labels the process as passive diffusion, making it incorrect.

Option 3: It requires energy and is called active transport. This description matches the fundamental concept: moving ions like Na+ against their concentration gradient uses energy, typically from ATP hydrolysis via pumps such as the sodium-potassium pump, which is a classic example of active transport. The phrase correctly identifies both the energy requirement and the transport category.

Option 4: It requires energy and is called filtration. Filtration involves movement of water and solutes through a membrane due to pressure differences, not an energy-driven, selective transport against a concentration gradient for ions like Na+. Labeling this as filtration mischaracterizes the mechanism at play.

In summary, option 3 accurately describes the process as energy-requiring active transport, while the other options either misstate the energy requirement or mislabel the transport mechanism.

In the normally functioning cell, Na+ is moved out of the cell against a concentration gradient. Which of the following statements is correct about this process?

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In the normally functioning cell, Na+ is moved out of the cell against a concentration gradient. Which of the following statements is correct about this process?

查看解析

登录即可查看完整答案

类似问题

Question at position 85 The sodium-potassium pump is an example of:active transportpinocytosisosmosisphagocytosisfacilitated diffusion

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希望你的学习变得更简单

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