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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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When marathoners or other endurance athletes sweat heavily and drink a large amount of pure water their sodium level drops. The resulting condition, called “water intoxication,” can be fatal. Why is maintaining the sodium level so important?

Summary Introduction

To explain: The importance of maintaining sodium level in the body.

Concept introduction: A hypotonic environment contains less solute concentration than the solutes present in the cell and water will diffuse inside the cell.

Explanation

Athletes sweat heavily and water replacement is necessary to maintain the electrolytes concentration in the body. However, intake of a large amount of water dilutes the sodium level in the blood. This creates a hypotonic environment in the blood when compared to the environment inside the cell. This causes water to enter into the cell and to swell...

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