The Crossword Solver found answer to “Fish’s breathing organ”, 4 letters crossword clue. The Crossword Solver finds answers to American-style crosswords, British-style crosswords, general knowledge crosswords and cryptic crossword puzzles.
Answer : GILL
gill, branchia – n
respiratory organ of aquatic animals that breathe oxygen dissolved in water
Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries. As the fish opens its mouth, water runs over the gills, and blood in the capillaries picks up oxygen that’s dissolved in the water. Then the blood moves through the fish’s body to deliver the oxygen, just like in humans. All bony fish also have a bony plate called an operculum, which opens and closes to protect the gills.
Fish aren’t the only undersea organisms to use gills, however. Mollusks and crustaceans also have gills that operate the same way by pulling oxygen out of the water as it runs over the gills. Some animals even display their gills outside of the body: the name “nudibranch” (commonly known as sea slugs) comes from Greek and Latin words meaning “naked gills.” Nudibranchs often have feathery, brightly-colored ones that are exposed on their backs.
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