Fluids and Electrolytes Essay

1287 Words Sep 14th, 2013 6 Pages
Advanced Pathophysiology & Health Assessment NUR5703 2011
Pre-course Learning Objectives:
Fluids and Electrolytes: 1. Identify and describe the composition of the fluid compartments within the body
Either Intracellular fluid (ICF- 2/3 of the body’s water) or extracellular fluid (ECF -one third of the body’s water). The two main extracellular fluid compartments are the interstitial fluid and the intravascular fluid, which is the blood plasma. Other ECF compartments include the lymph and the transcellular fluids such as the synovial , intestinal, bilary, hepatic, pancreatic, CSF, sweat, urine, pleural, peritoneal, pericardial and intraocular fluids.

2. Discuss the function of the following electrolytes within the body and
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Likewise sodium imbalances occur with alterations in body water volume. Generally these alterations can be classified as changes in tonicity, or the change in the concentration of electrolytes in relation to water. Alterations can therefore be classified as isotonic, hypertonic or hypotonic. * Isotonic: (isoosmolar) gain or loss of extracellular fluid (ECF) resulting in a concentration equivalent to a 0.9% sodium chloride solution; no shrinkage or swelling of cells * Hypertonic: (hyperosmolar imbalance) Imbalances that result in an ECF concentration greater than 0.9% sodium chloride solution ie. Water loss or solute gain; cells shrink in a hypertonic fluid. * Hypotonic: (hypoosmolar imbalance) Imbalance that results in an ECF less than 0.9% sodium chloride, ie. Water gain or solute loss; cells swell in a hypotonic fluid.

4. Identify what the term osmolarity, in relation to body fluids and what the normal value is: The total concentration of dissolved materials in a solution, regardless of their specific identities, expressed in moles. 5. Describe the regulation of thirst and ADH secretion in the body: Thirst is primarily a regulator of water intake and ADH a regulator of water output. Both mechanisms respond to changes in extracellular osmolality and the effective circulating volume.
Thirst: Secretion of ADH and perception of thirst are primary factors in the regulation of water balance.

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