describe inspiration and expiration in fish
Answers
Answer:
Fish obtain oxgen that is dissolved in the water. This occurs via the gills. Gills are feathery structures inundated with blood vessels which allow for a large surface area in contact with the oxygen present in the water. The gills are thin and moist which is ideal for a respiratory structure. In bony fish, an operculum covers the gills and can be used for pumping water across the gills. Sharks don't have this bony gill cover and rely on water flowing into the mouth and across the gills. They must swim to keep breathing. In Osteichthyes or bony fish, at the gills a countercurrent flow occurs to allow the most diffusion into the blood. As deoxygenated blood flows across the gill one way, oxygenated water flows the opposite way. There is a difference or concentration gradient that is established which allows for the most diffusion into the circulating blood. This is not true of Chondrichthyes or cartilaginous fish because they don't have a bony operculum to aid in water being pumped across the gills. Fish also rely on the nervous system in respiration as the brainstem contains nerve cells that establishes a respiratory rhythm.
The inspiration and expiration in fish
Explanation:
- As most fish live in freshwater most of them use gills. during the process inspiration of the fish opens its lower side of the mouth muscles and lowers the water pressure within the month.
- During the expiration process the fish closes the muscles of the mouth and pushes the walls of the operculum this increases the internal volume and internal pressure within the mouth.
- The process takes place through the gills of fish. Some larger fish can move continuously with their mouths open to water flowing through their gills.
Learn more about the inspiration and expiration in fish.
- brainly.in/question/10248042 answered by vibhavrimishra.