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2 Body fluids.docx

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Physiology 2130
Anita Woods

2. Body Fluids Introduction  Our internal environments are bathed in fluids  Because of homeostasis, the volume of the fluid and the concentration of ions is closely controlled so our organ systems can function properly Body Fluid Compartments  The body is divided into two major fluid compartments: o Intracellular fluid compartments (ICF): inside all cells o Extracellular fluid compartments (ECF): everything outside the cells  The Extracellular fluid which makes up the internal environment of the body can be divided into o Interstitial fluid compartment: the fluid directly outside, bathing the cells o Plasma: watery portion of the blood  Average 70 kg (154 lb.) person: o The total body water (TBW) found in all compartments is 42 liters (L) or 11.11 gallons Compartment Volume Percentage ICF 28L or 7.4 gallons 67% Interstitial compartments 11L or 2.9 gallons 26.4% Plasma: 3L or 0.8 gallons 6.6% A quick look at Plasma  Plasma is a pale yellow fluid that consists of about 92% water and 8% of other substances such as proteins, nutrients, ions, gases and waste products  Plasma is a colloidal solution – a liquid containing suspended substances that do not settle out of solution o Most suspended substances are plasma proteins such as  Albumins  Globulins,  Fibrinogen  Plasma volume stays relatively constant due to o Water intake throu
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