WebThe fish uses a special gas exchange organ (gills). It has a large surface area and a short distance for gas exchange to the blood capillaries. Water flows over the filaments, and oxygen can diffuse down its concentration … WebTable 2 shows some features of gas exchange in a fish and in a mammal. Feature Fish Mammal Percentage of oxygen extracted from water or air 80 25 Oxygen consumption at rest / cm. 3 . kg 1 . hour 1. 100 200 Table 2 (b) (i) The fish has a body mass of 0.2 kg. Calculate the volume of water it will need to pass

Gas Exchange in Bony Fish freesciencelessons

WebIt allows air to enter the insect and flow into the system of tracheae. There are rigid rings of cartilage that keep the tracheae open. A large number of tracheoles run between cells and into the muscle fibres - the site of gas exchange. For smaller insects, this system provides sufficient oxygen via diffusion. WebSep 14, 2024 · Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing counter-current exchange. The gills push the oxygen-poor water out through openings in the sides of the pharynx. How do fish gills work? motherboard built in cpu

A Level Biology – Gas Exchange in Fish – Countercurrent Principle …

WebFish 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 … WebDec 28, 2024 · Fish have thick skin that enable them to be waterproof however the result of this is gases cannot readily diffuse through the skin. Fish also have a small surface area : volume ratio. Body surface … minist agr rural affairs