27. All animals respire, but the modes of
respiration are different in animals
because of the body's structural
organisation and environment they live
in. Elaborate by focussing on the
different ways of respiration present in
animals.
Answers
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→Along the evolutionary tree, different organisms have devised different means of obtaining oxygen from the surrounding atmosphere.The complexity of the respiratory system is correlated with the size of the organism. As animal size increases, diffusion distances increase and the ratio of surface area to volume drops.Respiration in fish or in any entity living in the water differs from that of human beings. Organisms such as fish, living in water, need oxygen to breathe for cells to sustain. Fish possess specialized structures to carry out the respiratory function, helping them inhale oxygen dissolved in water.The process of respiration involves taking in oxygen (of air) into cells, using it for releasing energy by burning food, and then eliminating the waste products (carbon dioxide and water) from the body.Respiration can occur using a variety of respiratory organs in different animals, including skin, gills, and tracheal systems.
Answer: Along the evolutionary tree, different organisms have devised different means of obtaining oxygen from the surrounding atmosphere. ... The complexity of the respiratory system is correlated with the size of the organism. As animal size increases, diffusion distances increase and the ratio of surface area to volume drops
All aerobic organisms require oxygen to carry out their metabolic functions. Along the evolutionary tree, different organisms have devised different means of obtaining oxygen from the surrounding atmosphere. The environment in which the animal lives greatly determines how an animal respires. The complexity of the respiratory system is correlated with the size of the organism. As animal size increases, diffusion distances increase and the ratio of surface area to volume drops. In unicellular organisms, diffusion across the cell membrane is sufficient for supplying oxygen to the cell Diffusion is a slow, passive transport process. In order for diffusion to be a feasible means of providing oxygen to the cell, the rate of oxygen uptake must match the rate of diffusion across the membrane. In other words, if the cell were very large or thick, diffusion would not be able to provide oxygen quickly enough to the inside of the cell. Therefore, dependence on diffusion as a means of obtaining oxygen and removing carbon dioxide remains feasible only for small organisms or those with highly-flattened bodies, sucs as many flatworms (Platyhelminthes). Larger organisms had to evolve specialized respiratory tissues, such as gills, lungs, and respiratory passages accompanied by a complex circulatory systems, to transport oxygen throughout their entire body.
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