Question

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?
Cells swell as water moves into them.
Cells swell as water moves out of them.
Cells shrivel as water moves out of them.
Cells shrivel as water moves into them.

Answer 1

Cells swell as water moves into them.

Reason: Low blood (extracellular) Na+ makes the extracellular fluid hypotonic relative to cells, so water flows into cells by osmosis, causing them to swell.