aquatic respiration

Aquatic respiration is how fish and other aquatic animals breathe underwater. They use special organs called gills that extract oxygen from water as it flows over them. Water passes through the gills, where tiny blood vessels absorb the oxygen. The oxygen then enters the bloodstream and is transported to the body tissues, allowing the animal to produce energy. This process is similar to how land animals breathe air with lungs, but aquatic animals have adapted gills specifically for extracting oxygen from water, which contains less oxygen than air.