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← Human Body & HealthIf a marathon runner only consumes sports drinks high in electrolytes without adequate water intake, which consequence follows regarding their plasma osmolality?
A)Osmolality decreases significantly due to dilution
B)Sodium concentration always remains within normal range
C)The runner will not experience any cramping
D)Osmolality rises activating the thirst mechanism✓
💡 Explanation
Plasma osmolality will increase because the high electrolyte intake without enough water leads to a concentration of solutes in the blood; therefore, the thirst mechanism is triggered to promote fluid intake rather than a decrease in osmolality from dilution.
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