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 glass glass holds 16 oz. to its rim. With a half inch of foam, the actual liquid fill is roughly 14 oz. Recently (as of 2008), some restaurants have replaced 16-ounce pint glasses (473 mL) with 14 ouncers (415 mL) to which customers have objected. In response to this, legislation has been introduced in the state of Michigan (known for its craft brewing culture) to require bars to serve 16-ounce pints. It is increasingly common to find pint glasses which contain markings on the base; very often these glasses are branded to one particular beer. The markings themselves are formed from