How does the gas exchange occur in fish?

Question

i need to know how gas exchange works in fish. could u please include in ur answers the functions of gill lamella, operculum, counter current, diffusion etc. please help. and thanks.

Answer 1

This is a great site for fish respiration... http://www.examstutor.com/biology/resources/studyroom/organs_and_systems/gas_exchange/exchange_fish.php

Nosoop4u

Answer 2

Insects Insects have no transport system so gases need to be transported directly to the respiring tissues. There are tiny holes called spiracles along the side of the insect. The spiracles are openings of small tubes running into the insect's body, the larger ones being called tracheae and the smaller ones being called tracheoles. The ends of these tubes, which are in contact with individual cells, contain a small amount of fluid in which the gases are dissolved. The fluid is drawn into the muscle tissue during exercise. This increases the surface area of air in contact with the cells. Gases diffuse in through the spiracles and down the tracheae and tracheoles. FISH Fish use gills for gas exchange. Gills have numerous folds that give them a very large surface area. The rows of gill filaments have many protrusions called gill lamellae. The folds are kept supported and moist by the water that is continually pumped through the mouth and over the gills. Fish also have an efficient transport system within the lamellae which maintains the concentration gradient across the lamellae. The arrangement of water flowing past the gills in the opposite direction to the blood (called countercurrent flow) means that they can extract oxygen at 3 times the rate a human can. The spiracles can be closed by valves and may be surrounded by tiny hairs. These help keep humidity around the opening, ensure there is a lower concentration gradient of water vapour, and so less is lost from the insect by evaporation. btw use the site its really good nd there is photos to explain it .. hope i helped! :)

Answer 3

I cant give you that much in detail but i did send the question to someone who will be able to give you all the info youll ever need.