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Athletes lose salt and water as they compete. The hotter it gets, the more they sweat. If they drink only pure water after exercise, their blood cells swell. If they have worked very hard for a long time, some of their red blood cells may even burst.
a) Why do blood cells burst
b) how much solute should be added to the water than an athlete drinks after exercise. Why?
Blood cells don't necessarily swell or shrink. They are just bags of oxygen. General cells, such as skin, brain, liver, etc are the ones that swell and shrink. Well, the reasons cells work is that with expelling of solutes from the pores of the skin, the body is losing ion, electrolytes, etc. in the sweat causing them to shrink (crenate). With the shrinking, the cells lose some elasticity of the membrane that needs to be slowly gotten back. With pure water, if too much is drank then the cell swells too much. Drinking pure water causes the concentration of ions and such outside the cell to be hypotonic (lower concentration of solutes than inside the cell). To try to balance the concentrations out with osmosis, water goes into cells to dilute the higher concentration causing the cells to swell. Too much water, the cells lyse (burst).
Solutes do not need to be added to water. Pure water will hydrate just fine as long as it is done in reasonable amounts. Tap water already has some ions in it, so the hydration is less.
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