When soaked in a hypertonic solution, water will move ____ the red blood cells.

Question

BlackTom AI · Accepted Answer

When red blood cells are placed in a hypertonic solution, the surrounding fluid has a higher solute concentration than the fluid inside the cells, causing water to move out of the cells by osmosis.
Option 1: 'in and out in equal amounts of' would imply no net movement of water, which is incorrect in a hypertonic environment because there is a driving osmotic gradient.
Option 2: 'into' would mean water moves from the cell to the outside only if the outside were hypotonic relative to the cell interior; in a hypertonic solution, the gradient goes the other way, so this is not the expected direction.
Option 3: 'out of' correctly describes water leaving the red blood cells to equilibrate the higher external solute concentration, leading to cell shrinkage (crenation).
In summary, the hypertonic external solution creates a net outward flow of water from the cells, which aligns with the principle of osmosis favoring movement from lower to higher solute concentration across a semipermeable membrane.

When soaked in a hypertonic solution, water will move ____ the red blood cells.

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