Question

brane transport (2 of 4): the sodium - potassium pump (bioflix tutorial)
complete the diagram below using the following steps.

1. use targets of group 1 to indicate the relative concentrations of na⁺ and k⁺ inside and outside the cell.
2. use targets of group 2 to indicate the relative charges inside and outside the cell.
3. use targets of group 3 to indicate how many ions move through the pump and in which directions.

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Explanation:

Step1: Recall sodium - potassium pump function

The sodium - potassium pump moves 3 Na⁺ out of the cell and 2 K⁺ into the cell. Outside the cell, [Na⁺] is high and [K⁺] is low. Inside the cell, [Na⁺] is low and [K⁺] is high.

Step2: Determine charge distribution

Since 3 positive - charged Na⁺ are pumped out and 2 positive - charged K⁺ are pumped in, there is an excess positive charge outside the cell and an excess negative charge inside the cell.

Step3: Identify ion movement through pump

The pump moves 3 Na⁺ out of the cell and 2 K⁺ into the cell.

Answer:

For Group 1 (outside cell): [Na⁺] high, [K⁺] low; (inside cell): [Na⁺] low, [K⁺] high.
For Group 2 (outside cell): excess + charge; (inside cell): excess - charge.
For Group 3: 3 Na⁺ out, 2 K⁺ in.