Question

How does a fish in an aquarium absorb oxygen?

Answer 1

Oxygen absorption by fish:

1. Fishes have gills to breathe and derive oxygen from its surrounding.
2. The water from outside enters the fish via the mouth and rushes into its gills.
3. The oxygen present in the water diffuses into the blood present in capillaries and this blood is now circulated throughout to deliver oxygen.
4. Carbon dioxide is expelled and the water carrying carbon dioxide exits the fish via openings in the sides of the throat called the operculum.