Osmolarity is a measure of the concentration of solute particles in a solution, expressed as osmoles of solute per liter of solution. It is crucial for understanding how fluids move in and out of cells through osmosis, which directly affects hydration, nutrient absorption, and waste elimination in the body. High osmolarity indicates a higher concentration of solutes, which can lead to water moving out of cells, whereas low osmolarity can result in water moving into cells, impacting cellular function and overall homeostasis.
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