Chapter 8 water and alcohol

Chapter 8 water and alcohol - Chapter 8 - Water and Alcohol...

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Chapter 8 - Water and Alcohol Fluids - Substances composed of freely moving molecules - Have the ability to conform to the shape of their container *50-70 % of a healthy adult’s body is composed of fluids. About 2/3 of the body’s fluid is held within cells. The remaining 1/3 is outside our cells and composed of: tissue fluid found between the cells within tissues and organs of the body. plasma , the fluid portion of blood that carries the blood cells. The body fluid composition of tissue varies by: tissue type – lean tissues have higher fluid content than fat tissues Muscle ~ 70% Fat ~ 10% gender – males have more lean tissue and therefore more body fluid age – lean tissue is lost with age, and body fluid is lost with it Infants ~75% lderly ~ 50% Functions of Fluids - Fluids dissolve and transport substances. - Water is an excellent solvent because it can dissolve many different substances. **Substances dissolved in body fluids include ions, sugars, amino acids, vitamins, and minerals. **Soluble waste are eliminated via urine made from body water
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**Fluids account for blood volume. Blood volume is the amount of fluid in the blood. - Increased blood volume can cause blood pressure to rise. - Decreased blood volume can cause low blood pressure. Fluids help maintain body temperature. - Much external energy is required to raise the temperature of water. This helps the temperature of our body fluids remain quite stable. - Sweating releases heat as the evaporation of water from the skin cools t he skin and blood. Fluids protect and lubricate body tissues. - Cerebrospinal fluid protects the brain and spinal column. - Amniotic fluid protects the fetus. Fluids within our joints act as a lubricant. - Digestive secretions allow for easy passage of material. Maintaining Fluid Balance - Any water lost from the body must be replaced. - Water is lost through urine, sweat, exhalation, and feces. - Water is gained through beverages, food, and metabolic reactions.
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This note was uploaded on 05/05/2010 for the course MCB 181R taught by Professor Leonard during the Spring '08 term at University of Arizona- Tucson.

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Chapter 8 water and alcohol - Chapter 8 - Water and Alcohol...

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