BIO 3302 Study Guide - Extracellular Fluid, Osmotic Concentration, Evaporation

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15 Jul 2014
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Ecf extracellular fluid is made of interstitial fluid and plasma. Plasma is the liquid component of the blood. Internal homeostasis is regulated by: osmotic regulation, ionic regulation, excretion. Ions that are exchanged between the ecf, the icf, and the external environment include na+, k+, ca2+, and cl-. Osmoregulators tightly regulate their body osmolarity regardless of their environment, within a narrow range of osmolarities. Osmoconformers match their body osmolarity to their environment. Summary of avenues for water and ion exchange: Regulated exchanges: physiologically controlled for the maintenance of homeostasis. Ex: peeing a liter a day due to drinking too much, active epithelial transport. Obligatory exchanges: occurs as a result of physical factors over which the animal has little or no physiological control. Ex: peeing the standard obligatory 50ml a day, transepithelial diffusion, ingestion, defecation, metabolic water production. Factors affection obligatory changes: transepithelial gradients, surface to volume ratio, permeability, feeding, temperature, exercise, convection, metabolism.

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