AP BIOLOGY

Detailed explanation-1: -The blood capillaries in the gill filaments are close to the gill surface to take up oxygen from the water and to give up excess carbon dioxide to the water.

Detailed explanation-2: -Stay Current. Like us, fish also need to take in oxygen and expel carbon dioxide in order to survive. But instead of lungs, they use gills. Gills are branching organs located on the side of fish heads that have many, many small blood vessels called capillaries.

Detailed explanation-3: -Fish take water into their mouth, passing the gills just behind its head on each side. Dissolved oxygen is absorbed from-and carbon dioxide released to-the water, which is then dispelled. The gills are fairly large, with thousands of small blood vessels, which maximizes the amount of oxygen extracted.

Detailed explanation-4: -Gills aid in the removal of dissolved oxygen from water. Water comes through the mouth and passes through the gills. Gill capillaries absorb oxygen dissolved in water and help in the removal of CO2 from the body.

Detailed explanation-5: -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.