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 of Science Pint of Science Pint of Science is a science festival that aims to communicate contemporary scientific developments to the public in an interesting, engaging and approachable way by bringing scientists to the pub and other accessible places. The festival takes place annually in the month of May and covers all aspects of research which are themed under the titles 'Beautiful Mind', 'Atoms to Galaxies', 'Our Body', 'Planet Earth', 'Tech Me Out' and 'Our Society'. The 2018 Pint of Science festival took place in nearly 300 cities in 21 countries. It is mainly run by volunteer postgraduate and postdoctoral researchers who