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13 Cards in this Set

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  • Back

diffusion

transport of material due to the random movement of particles; net movement is from areas of high concentration to areas of low concentration

hyperosmotic

a term describing organisms with body fluids with a lower concentration of water and higher solute concentration than the external environment.

hypoosmotic

a term describing organisms with body fluids with a higher concentration of water and lower solute concentration than the external environment

isomotic

a term describing organisms with body fluids containing the same concentration of water and solutes as the external environment

matric frrces

a force resulting from water's tendency to adhere to the walls of containers such as cell walls or the soil particles lining a soil pore

metabolic water

water released during oxidation of organic molecules.

osmoregulation

regulation of internal salt concentration and water using a variety of anatomical structures and physiological processes; an energy-consuming process

osmosis

diffusion of water down its concentration gradien

relative humidity

a measure of the water content of air relative to its content at saturation; relative humidity = water vapor density/saturation water vapor density × 100

saturation water vapor pressure

the pressure exerted by the water vapor in air that is saturated with water vapo

vapor pressure deficit

the difference between the actual water vapor pressure and the saturation water vapor pressure at a particular temperature.

water potential

the capacity of water to do work, which is determi-ned by its free energy content; water flows from positions of higher to lower free energy. Increasing solute concentration decreases water potential

water vapor pressure

the atmospheric pressure exerted by the water vapor in air; increases as the water vapor in air increases.