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 Latin "pincta" meaning "painted", for marks painted on the side of a container to show capacity. In the United States, the liquid pint is legally defined as one-eighth of a liquid gallon of precisely 231 cubic inches. In the United States, the dry pint is one-eighth of a dry gallon. The United States dry pint is equal to one-eighth of a United States dry gallon. It is used in the United States, but is not as common as the liquid pint. A now-obsolete unit of measurement in Scotland known as the "Scottish pint" or "joug" equals three imperial pints. It