Which of the following is true of the sodium-potassium exchange pump?
A) It maintains sodium at equal intracellular and extracellular levels.
B) It is a passive transport process.
C) It moves sodium into the cell and potassium out of the cell.
D) There is one type of carrier protein for sodium and a different type of carrier protein for potassium.
E) It is an example of active transport.
E) It is an example of active transport.
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a. in the stomach b. in the small intestine lumen c. on the brush borders of the small intestine epithelial cells d. in the colon e. in the rectum
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