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Respiration can occur using a variety of respiratory organs in different animals, including skin, gills, and tracheal systems.
Describe how the skin, gills, and tracheal system are used in the process of respiration
Some animals, such as amphibians and earthworms, can use their skin (integument) to exchange gases between the external environment and the circulatory system due to the network of capillaries that lie below the skin.
Fish and other aquatic organisms use gills to take up oxygen dissolved in the water and diffuse carbon dioxide out of the bloodstream.
Some insects utilize a tracheal system that transports oxygen from the external environment through openings called spiracles.
There are various methods of gas exchange used by animals.
As seen in mammals, air is taken in from the external environment to the lungs.
Other animals, such as earthworms and amphibians, use their skin (integument) as a respiratory organ.
A dense network of capillaries lies just below the skin, facilitating gas exchange between the external environment and the circulatory system.
The respiratory surface must be kept moist in order for the gases to dissolve and diffuse across cell membranes.
Organisms that live in water also need a way to obtain oxygen.
Oxygen dissolves in water, but at a lower concentration in comparison to the atmosphere, which has roughly 21 percent oxygen.
Fish and many other aquatic organisms have evolved gills to take up the dissolved oxygen from water .
Gills are thin tissue filaments that are highly branched and folded.
When water passes over the gills, the dissolved oxygen in the water rapidly diffuses across the gills into the bloodstream.
The circulatory system can then carry the oxygenated blood to the other parts of the body.
In animals that contain coelomic fluid instead of blood, oxygen diffuses across the gill surfaces into the coelomic fluid.
Gills are found in mollusks, annelids, and crustaceans.
The folded surfaces of the gills provide a large surface area to ensure that fish obtain sufficient oxygen.
Diffusion is a process in which material travels from regions of high concentration to low concentration until equilibrium is reached.
In this case, blood with a low concentration of oxygen molecules circulates through the gills.
The concentration of oxygen molecules in water is higher than the concentration of oxygen molecules in gills.
As a result, oxygen molecules diffuse from water (high concentration) to blood (low concentration) .
Similarly, carbon dioxide molecules diffuse from the blood (high concentration) to water (low concentration).
Insect respiration is independent of its circulatory system; therefore, the blood does not play a direct role in oxygen transport.
Insects have a highly-specialized type of respiratory system called the tracheal system, which consists of a network of small tubes that carries oxygen to the entire body.
The tracheal system, the most direct and efficient respiratory system in active animals, has tubes made of a polymeric material called chitin.
Insect bodies have openings, called spiracles, along the thorax and abdomen.
These openings connect to the tubular network, allowing oxygen to pass into the body, regulating the diffusion of CO2 and water vapor .
Air enters and leaves the tracheal system through the spiracles.
Some insects can ventilate the tracheal system with body movements.
The tracheal system uses trachea for diffusion of O2 into the body and CO2 out of the body., The tracheal system uses spiracles to allow for entrance of O2 only into the body., The tracheal system does not participate in gas exchange., and The tracheal system uses spiracles for diffusion of O2 into the body and CO2 out of the body.
The gills allow oxygen in water to diffuse in the bloodstream., The gills allow the CO2 in the bloodstream to diffuse into the water., The gills do not participate in gas exchange and only transport oxygen from the water., and The gills allow oxygen in water to diffuse into the bloodstream and CO2 to diffuse into the water.