NEET BIOLOGY

Detailed explanation-1: -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-2: -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.

Detailed explanation-3: -Gills are feathery organs full of blood vessels. A fish breathes by taking water into its mouth and forcing it out through the gill passages. As water passes over the thin walls of the gills, dissolved oxygen moves into the blood and travels to the fish’s cells.

Detailed explanation-4: -Explanation: Fishes use gills for the exchange of gases. As the water enters through mouth it flows through gills. Capillaries in the gills absorb oxygen dissolved in water and also help in expelling out CO2 from the body.

Detailed explanation-5: -Gills are positioned next to the mouth cavity of fish. Fish use their mouths to draw oxygen-rich water in and pump it over their gills. Most fish have a skin flap that protects their gills. They help with the gas exchange by absorbing oxygen dissolved in the water.