AP BIOLOGY

Detailed explanation-1: -The respiratory organ present in fishes are known as gills. They breathe air that is dissolved in water through gills. Gills are well supplied with blood vessles for exchange of gases.

Detailed explanation-2: -Fish gills are organs that allow fish to breathe underwater. Most fish exchange gases like oxygen and carbon dioxide using gills that are protected under gill covers (operculum) on both sides of the pharynx (throat). Gills are tissues that are like short threads, protein structures called filaments.

Detailed explanation-3: -Gills are the respiratory organs for fishes. Water dissolves many gases like argon, nitrogen, methane, oxygen etc. The dissolved oxygen is used by living organisms in the water for breathing and respiration.

Detailed explanation-4: -The gills are composed of three main parts: filaments, rakers, and arches. The arches are the structural component of the gill, rakers prevent debris from entering the fish through the gills, and the filaments absorb oxygen.

Detailed explanation-5: -Fishes have gills as the respiratory organs which extract oxygen dissolved in water and take away carbon dioxide from the body.