NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL STRUCTURE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What would happen to a red blood cell that has a higher concentration of water on the outside of it than on the inside of it?
A
It would swell up.
B
It would stay the same size.
C
It would shrivel up and shrink.
D
None of the above
Explanation: 

Detailed explanation-1: -When red blood cells are in a hypertonic (higher concentration) solution, water flows out of the cell faster than it comes in. This results in crenation (shriveling) of the blood cell.

Detailed explanation-2: -Cells are surrounded by a fluid that has a similar concentration as them. If the concentration of the fluid surrounding the cell is drastically different then osmosis can occur. Osmosis can lead to the cell lysing due to the intake of excess water, or it can lead to the cell shriveling due to the loss of water.

Detailed explanation-3: -When placing a red blood cell in any hypertonic solution, there will be a movement of free water out of the cell and into the solution. This movement occurs through osmosis because the cell has more free water than the solution.

Detailed explanation-4: -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.

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