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
Gills Rock, Wisconsin Lake Michigan to Green Bay, also known as Porte des Morts. The Pilot Island Light is located on Pilot Island near Gills Rock. Gills Rock is also the departure point of a ferry to Washington Island. The town is the birthplace of fictional character Gwen Raiden from the TV series "Angel." Gibraltar Area Schools serves the community. Gibraltar Elementary School and Gibraltar Secondary School are the two schools. Gills Rock, Wisconsin Gills Rock is an unincorporated community located on Highway 42 at the northern tip of the Door Peninsula in Door County, Wisconsin, United States. It is within the town