Red blood cells are suspended in a solution of NaCl. The cells have an osmolarity of 300 mOsM, and the solution has an osmolarity of 250 mOsM. (a) The solution is (hypertonic, isotonic, or hypotonic) to the cells. (b) Water would move (into the cells, out of the cells, or not at all).

The correct answer is - a) hypotonic, b) in to the cells.

Explanation:

Osmotic concentration is measure in osmole or mOsM, which tells the number of solute moles that are cause the osmotic pressure of a solution. So the osmolarity of the cell is more than the solution of the NaCl is hypotonic solution as the inner side has more osmolarity than outside of the cells. As it is in hypotonic cell the movement of the water would be into the cells and cell would swell.

Thus, the correct answer is -  a) hypotonic, b) in to the cells.

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