Chapter%207%20Outline%20for%20posting - Chapter 7 Outline I...

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Chapter 7 Outline I. What Are Fluids and Electrolytes and What Are Their Functions? A. A fluid is composed of molecules that move past one another freely, adapting to the shape of the container that holds it. B. Body fluid is the liquid portion of our cells and tissues. 1. Between 50 and 70% of a healthy adult’s body weight is fluid. a. Two-thirds of our body fluid is intracellular fluid. b. One-third of our body fluid is extracellular fluid. 1. Tissue fluid flows between the cells. 2. Plasma is the liquid portion of blood C. Body fluid is composed of water and dissolved substances called electrolytes. 1. Body fluids contain a variety of dissolved substances (solutes). a. Four major minerals found in body fluid are sodium, potassium, chloride, and phosphorus. 1. Minerals are consumed as salts. 2. Mineral salts are called electrolytes because they form ions when they dissolve in water. D. Fluids serve many critical functions. 1. Fluids dissolve and transport substances. 2. Fluids account for blood volume. 3. Fluids help maintain body temperature. 4. Fluids protect and lubricate our tissues. E. Electrolytes support many body functions. 1. Electrolytes help regulate fluid balance. a. Water follows the movement of electrolytes. b. Life-threatening fluid and electrolyte imbalances can result from excessive diarrhea or vomiting. 2. Electrolytes enable our nerves to respond to stimuli. 3. Electrolytes signal our muscles to contract. II. How Does Our Body Maintain Its Fluid Balance? A. Our thirst mechanism prompts us to drink fluids. 1. The thirst mechanism in the hypothalamus prompts thirst. a. Increased salt concentration causes thirst. b. Reduction in blood volume or blood pressure causes thirst. c. Dryness in the tissues of the mouth and throat causes thirst. 2. Kidneys return more water to the bloodstream and secrete an enzyme that causes constriction of blood vessels. B. We gain fluids through consuming beverages and foods, and through metabolism. 1. The three primary sources of fluid are beverages, foods, and the production
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This note was uploaded on 10/13/2010 for the course FSHN FSHN 120 taught by Professor Rebeccaroach during the Spring '09 term at University of Illinois at Urbana–Champaign.

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Chapter%207%20Outline%20for%20posting - Chapter 7 Outline I...

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