What is gill respiration?

What Does gill respiration Mean

The breath is the absorption and expulsion of air . Once the air enters the organism of a living being, it takes certain substances and then expels it, already modified due to the process.

Living things breathe in air to receive oxygen that is fixed in the blood and then exhale to remove carbon dioxide . This gas exchange process is known as hematosis and it develops with different organs according to the species.
The gill breathing is one that is carried out through the gills (structures which are also known by the name of "guts"). A large number of aquatic animals have these organs that allow them to absorb the oxygen found in the water and eliminate carbon dioxide.

The fish , thus use gills for absorbing oxygen, which then passes to the blood reaching the tissues . The respiration process is completed when the animal expels the carbon dioxide that is produced in cellular respiration.
While the lungs that humans and other mammals have are internal, the gills are external. These respiratory organs serve to start a process that the tissues then continue, where at the cellular level the mitochondria (cellular organelles) work on the production of carbon dioxide that is finally eliminated.
The gills arose throughout the evolution of aquatic species that acquired a certain size or considerable activity , since the others, those whose metabolic rate is not so great or their size is small, use the surface of their bodies to exchange the gases. These structures that specialize in the uptake of oxygen are those that organize the circulation of fluids, either in those species with a developed vascular system or in the rest, a group in which we can find mollusks, for example.
Why are the gills internal, as opposed to the tracheae and lungs? The answer is found in the characteristics of the movement of water through the body, since it is not very easy to carry out in such complex cavities, because it is a much denser element than air and because it rubs the walls with greater intensity. of the structures.
In order for gases to be exchanged successfully, it is necessary that there are no barriers between the incoming water and the cells of the epidermis ; for this reason, even in those species whose skin has strong scales, the gill tissues are fragile and soft. Regarding its anatomy , we can distinguish between two forms of gills:

* one that is made up of a large branch of appendages (relative to that of the animal). This is seen in annelids, larvae of newts and salamanders, mollusks and insect larvae;
* one that consists of slits that communicate the digestive tract with the outside, which we can observe in aquatic vertebrates that we call fish. They look like sheets that overlap and run through the blood vessels.
Gill respiration, however, develops in different ways according to the species . Fish that have a bony skeleton are responsible for pumping the water from the oropharyngeal area to a cavity that is under the operculum (a fin that protects the gills thanks to its hardness, and that opens when the mouth is closed to allow low pressure water flow). During this journey, the water passes through the gills that are responsible for the absorption of oxygen and its subsequent distribution throughout the body through the blood.

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