Mammalian red blood cells and osmotic balance Mammalian red blood cells circulat

Question

Mammalian red blood cells and osmotic balance Mammalian red blood cells circulate through the body surrounded by plasma, which has an osmolarity of Molar (M) solution of sodium chloride? Osmo r Osm what ou d happen f you put some re blod ce s in a 0.3 Check All That Apply 0 Nothing, since the solution of sodium chloride has the sameosmolarity as the plasma. The red blood cells will burst because water will diffuse into the cells until the membrane breaks. The red blood cells will shrivel up because water will diffuse out of the cells. Nothing, because the red blood cell membranes are impermeable to water and ions. Nothing, because as much water enters the cells as leaves them The osmotic pressure in the cells would be less than the surround solution.

Explanation / Answer

Ans : 3. The blood cells will shrivel up because water will diffuse out of the cells.

Reason:

NaCl has two ions and hence double the osmolarity. 0.15m Na Cl (normal saline) is isotonic with 0.3osm plasma. Here, the concentration of NaCl is 0.3 M. So it is hypertonic solution (higher solute concentration) . Due to Osmosis, water will flow out from the cell through the semipermeable membrane changing the shape of the cells to be shriveled.

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