¿Los animales sudan? – Sala del Agua

ENGLISH:

Use the controllers to operate the vision system and observe thoroughly.

Sea water contains more salt than the body of a saltwater fish, for that reason water tends to leave the body due to osmosis. Osmosis is the pass of water from a diluted solution – with more water- to a concentrated solution – with less water- through a semi permeable membrane, which allows the flow of water but not the pass of  the dissolved salts.

Sea fishes take water from the sea and expel the spare salt by the gills. Generally its urine is very concentrated to avoid water losses. Fresh water fishes act the other way round : they take water through the food and gills and produce a great amount of very diluted urine.

Terrestrial animals loss water constantly, either by perspiration or waste disposal. The intake and release must be balanced.