Drinking too much water during exercise can cause a condition in which the concentration of sodium in the blood is lower than normal. What immediate response would the blood cells have in this condition?

Drinking excessive water dilutes the sodium in the blood, making the fluid outside blood cells less concentrated than the fluid inside them. Water moves by osmosis toward the more concentrated fluid, so it enters the cells and causes them to swell. The correct choice is “Cells swell as water moves into them.”

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