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Phys Test 2
Definitions
22
Physiology
Graduate
10/17/2009

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Term
closed circulatory system
Definition
blood flows through network of blood vessels; all vertebrates have; intravascular volume of plasma and lymph; extravascular volume is interstitial; has other fluid compartments (coelomic, intraocular, cerebrospinal)
Term
open circulatory system
Definition
system in which extracellular hemolymph bathes organs directly w/ oxygen and nutrients
Term
vicinal water
Definition
water next to membrane of cell
Term
bulk water
Definition
water in between vicinal water and bound water
Term
bound water
Definition
water surrounding ion
Term
anhydrobiotic
Definition
desiccation tolerance in certain invertebrate animals (i.e., brine shrimp)
Term
ametabolic
Definition
process not requiring energy and metabolically inactive
Term
osmolar concentration
Definition
total number of moles of dissolved and osmotically active solutes per liter of solution
Term
osmolal concentration
Definition
number of moles of dissolved osmotically active solutes per kg of solvent
Term
dissociation coefficient
Definition
relates osmolar concentration to molal concentration using the dissociation of ions
Term
hemolymph
Definition
extracellular fluid in open circulatory system; no separate "hemo" or "lymph"; no blood, just lymph; can collect in sinuses
Term
compatible solutes
Definition
(stabilizing solutes); cause proteins to stay folded and completely precipitate out of solution
Term
perturbing solutes
Definition
(destabilizing solutes); affect tertiary and quaternary protein structure, causing protein to unfold
Term
counteracting solutes
Definition
trimethylamine oxide (stabilizing) and urea (destabilizing)
Term
osmoregulate
Definition
as concentration of solutes in medium increases, blood conc. of solutes stays same
Term
osmoconformer
Definition
does not actively exchange solutes with the environment, but keeps body fluids isotonic to the external environment by actively regulating their internal concentration of amino acids, ions, and proteins to match the osmolarity of the environment
Term
osmoregulator
Definition
actively control salt concentrations despite the salt concentrations in the environment to control body osmolarity, which remains constant
Term
stenohaline
Definition
low ability to tolerate broad ranges of salt salinities (ex: corals)
Term
euryhaline
Definition
high ability to tolerate wide range of salinities (ex: animals that live in estuaries--Fundulus heteroclitus)
Term
isotonic
Definition
equal concentration of solutes inside and outside of the cell (refers to inside of cell w/ respect to medium)
Term
hypertonic
Definition
outside of cell is more concentrated than inside; water flows out of cell
Term
hypotonic
Definition
inside of cell more concentrated than outside of cell; water flows inward
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