External gills usually contains muscle tissue, and may be moved by the animal as a free appendage, in order to stir up stagnant water. The stalk is lined by many thinly walled filaments (fimbriae), containing the majority of blood vessels used in gas exchange. Animals usually have one external gill originating on each gill arch (except the hyoid), which leads to there being three pairs of external gills in salamanders, and four in the gilled larvae of lungfish. External gills External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside
Pint fluid pint of water weighs about a pound (16 ounces), resulting in the popular saying, "A pint's a pound, the world around." However, a US pint of water weighs 1.04375 pounds and the statement does not hold the world around because the imperial (UK) pint, which was also the standard measure in Australia, India, Malaya, New Zealand, South Africa, etc., weighs 1.25 pounds. A different saying for the imperial pint is "a pint of water's a pound and a quarter". The pint is traditionally one-eighth of a gallon. In the Latin of the apothecaries' system, "octavius" or "octarius" (plural "octavii"