Red blood cells are isotonic Naci A red blood cell is hypoto

Red blood cells are isotonic Naci. A red blood cell is hypotonic I hypertonic to 0.9% to 2.5% NaCl. When the cell is placed in 2.5% NaCl, water will enter exit the cell, causing it to shrink swell

Solution

Red blood cells are isotonic to 0.9% NaCl. A red blood cell is hypotonic to 2.5% NaCl. When cell is placed in 2.5% NaCl, water will exit the cell, causing it to shrink.

(Detail description: Hypotonic solutions is one having less salt concentration whereas hypertonic solution is one with more salt concentration. In osmosis liquid moves from hypotonic (more solvent) to hypertonic (less solvent)solution until the equilibrium reached.

Here in initial condition both NaCl (0.9%) and RBCs have same salt concentration and therefore isotonic to each other. But when RBCs place in 2.5% Nacl (hypertonic as compared to RBCs), water starts moving out of cells and cells starts shrinking.)