LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What happens to red blood cells when they are placed in pure water?
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They lose water and shrink, becoming wrinkled (crenated)
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Their size and shape does not change.
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They gain water, swell and lysis can occur
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Explanation:
Detailed explanation-1: -If a red blood cell is placed in water, water enters the cell by osmosis. Because the membrane is quite weak the cell will burst as the volume and therefore the pressure in the cellincreases. Red blood cells shrink whenplaced in concentrated solutions of sugar as water moves out of them by osmosis.
Detailed explanation-2: -When red blood cells are placed in pure water, water rapidly enters the cells by osmosis and causes the cells to burst by a phenomenon known as hemolysis.
Detailed explanation-3: -A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.
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