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The Empirical Rule and Tchebysheff's Theorem can be used to describe data sets.
Atrial Natriuretic Peptide
A hormone secreted by the heart's atria that regulates blood pressure by decreasing sodium ion concentration and therefore reducing blood volume.
Osmoconformer
An animal in which the salt concentration of body fluids varies along with changes in the surrounding sea water so that it stays in osmotic equilibrium with its surroundings.
Osmoregulator
An organism that regulates its internal osmotic pressure, maintaining fluid and electrolyte balance despite external conditions.
Antidiuretic Hormone
A hormone released by the pituitary gland that regulates water retention in the body by increasing the concentration of solutes in the blood.
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