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14.9: XV Glossary

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    Active transport: Movement of solutes and ions across a cell membrane against a concentration gradient from an area of lower concentration to an area of higher concentration using energy during the process.

    Chvostek’s sign: An assessment sign of acute hypocalcemia characterized by involuntary facial muscle twitching when the facial nerve is tapped.

    Diffusion: The movement of solute particles from an area of higher concentration to an area of lower concentration.

    Edema: Swelling caused by excessive interstitial fluid retention.

    Extracellular fluids (ECF): Fluids found outside cells in the intravascular or interstitial spaces.

    Filtration: Movement of fluids through a permeable membrane utilizing hydrostatic pressure.

    Hydrostatic pressure: The pressure that a contained fluid exerts on what is confining it.

    Hypercapnia: Elevated levels of retained carbon dioxide in the body.

    Hypertonic solution: Intravenous fluids with a higher concentration of dissolved particles than blood plasma.

    Hypervolemia: Excess intravascular fluid. Used interchangeably with “excessive fluid volume.”

    Hypotonic solution: Intravenous fluids with a lower concentration of dissolved particles than blood plasma.

    Hypovolemia: Intravascular fluid loss. Used interchangeably with “deficient fluid volume” and “dehydration.”

    Interstitial fluids: Fluids found between the cells and outside of the vascular system.

    Intracellular fluids (ICF): Fluids found inside cells consisting of protein, water, and electrolytes.

    Intravascular fluids: Fluids found in the vascular system consisting of the body’s arteries, veins, and capillary networks.

    Isotonic solution: Intravenous fluids with a similar concentration of dissolved particles as blood plasma.

    Oncotic pressure: Pressure inside the vascular compartment created by protein content of the blood (in the form of albumin) that holds water inside the blood vessels.

    Osmolality: Proportion of dissolved particles in a specific weight of fluid.

    Osmolarity: Proportion of dissolved particles or solutes in a specific volume of fluid.

    Osmosis: Movement of fluid through a semipermeable membrane from an area of lesser solute concentration to an area of greater solute concentration.

    Passive transport: Movement of fluids or solutes down a concentration gradient where no energy is used during the process.

    Renin-Angiotensin-Aldosterone System (RAAS): A body system that regulates extracellular fluids and blood pressure by regulating fluid output and electrolyte excretion.

    Trousseau’s sign: A sign associated with hypocalcemia that causes a spasm of the hand when a blood pressure cuff is inflated.

    Urine specific gravity: A measurement of hydration status that measures the concentration of particles in urine.


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