Do the fish have different organs in the respiratory system?

Answer 1

All animals, fish and humans included, need to take in o2 and eliminate co2. Because in an aquatic environment water is dense and oxygen concentration is low, fish use gills kept moist by the surrounding water to obtain their oxygen needs as in this environment lungs would prove inefficient. When oxygen rich water is passed over their gills, the blood in the capillaries flowing in the opposite direction to the water in a process called counter current exchange, the fish are able to absorb all the oxygen they require. The deoxygenated water then returns to the surrounding water through openings in the side of the pharynx. Most fish are unable to breathe on land because the structure of air does not not support their gills, leading to their collapse. There would also be too much water loss due to evaporation, and both gills and lungs need to remain moist. Lungs remain moist simply because of ther location within the body. Respiration in humans happens when our diaphragm contracts and flattens, muscles in the ribcage moving to allow our lungs to expand with air. To exhale, the muscles relax. While gas exchange happens for fish around their gills, it happens for humans in tiny air sacs in our lungs called alveoli. The blood then carries o2 to all our cells via our many capillaries, tiny blood vessels so numerous that no cell is more than a few millimetres away from one. Once all its oxygen is lost and the co2 wastes have been collected, the deoxygenated blood then travels once more to the lungs to get a fresh supply and to get rid of the co2 which is lost when we exhale, and the process repeats.

Answer 2

Fishes have gills instead of lungs.

Gills are made up of lots of small folds, which increases the surface area over which oxygen can be absorbed. Gills are therefore very efficient at absorbing oxygen from water. This oxygen is then absorbed by the blood, much like it is in a lung.

For a fish to be able to breathe, water must constantly flow over its gills. This can be done either by continuously swimming or by pumping water over the gills.

Answer 3

Most fish exchange gases by using gills that are located on either side of the pharynx. Gills are made up of threadlike structures called filaments. Each filament contains a network of capillaries that allow a large surface area for the exchange of oxygen and carbon dioxide. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gill filaments. The blood in the capillaries flows in the opposite direction to the water, causing counter current exchange. They then push the oxygen-poor water out through openings in the sides of the pharynx. Some fishes, like sharks and lampreys, possess multiple gill openings. However, most fishes have a single gill opening on each side of the body. This opening is hidden beneath a protective bony cover called an operculum. Juvenile bichirs have external gills, a very primitive feature that they hold in common with larval amphibians. Swim bladder of a Rudd (Scardinius erythrophthalmus) Many fish can breathe air. The mechanisms for doing so are varied. The skin of anguillid eels may be used to absorb oxygen. The buccal cavity of the electric eel may be used to breathe air. Catfishes of the families Loricariidae, Callichthyidae, and Scoloplacidae are able to absorb air through their digestive tracts. Lungfish and bichirs have paired lungs similar to those of tetrapods and must rise to the surface of the water to gulp fresh air in through the mouth and pass spent air out through the gills. Gar and bowfin have a vascularised swim bladder that is used in the same way. Loaches, trahiras, and many catfish breathe by passing air through the gut. Mudskippers breathe by absorbing oxygen across the skin (similar to what frogs do). A number of fishes have evolved so-called accessory breathing organs that are used to extract oxygen from the air. Labyrinth fish (such as gouramis and bettas) have a labyrinth organ above the gills that performs this function. A few other fish have structures more or less resembling labyrinth organs in form and function, most notably snakeheads, pikeheads, and the Clariidae family of catfish. Being able to breathe air is primarily of use to fish that inhabit shallow, seasonally variable waters where the oxygen concentration in the water may decline at certain times of the year. At such times, fishes dependent solely on the oxygen in the water, such as perch and cichlids, will quickly suffocate, but air-breathing fish can survive for much longer, in some cases in water that is little more than wet mud. At the most extreme, some of these air-breathing fish are able to survive in damp burrows for weeks after the water has otherwise completely dried up, entering a state of aestivation until the water returns. Tuna gills inside of the head. The fish head is oriented snout-downwards, with the view looking towards the mouth. Fish can be divided into obligate air breathers and facultative air breathers. Obligate air breathers, such as the African lungfish, must breathe air periodically or they will suffocate. Facultative air breathers, such as the catfish Hypostomus Plecostomus, will only breathe air if they need to and will otherwise rely solely on their gills for oxygen if conditions are favourable. Most air breathing fish are not obligate air breathers, as there is an energetic cost in rising to the surface and a fitness cost of being exposed to surface predators.

Answer 4

Some fish internal parts include organs such as the kidneys. These organs, similarly to humans, perform respiration, digestion, and sensory reception. Other internal parts of a fish include gills and muscle, and other organs like the stomach, intestines, and liver.

Answer 5

The inner parts of the fish are called organs and include liver, reproductive organs and digestive system. If you were a fisherman though you would probably call them 'guts', which is a generic term for the innards of a fish that are removed prior to preparing the fish for cooking. This is where the term gutting a fish comes from.

Answer 6

Instead of lungs, fish have gills, which are designed to obtain oxygen from water.

Answer 7

• gills