evaluation in gases exchanging system

Exchange of gases is a common life process in all living organisms,but it is not same in all . single celled organisms ameoba or multicellular organisms like hydra & planarians obtain oxygen & expel carbon dioxide directly from the body by the process of diffusion.
In other multicellular animals special organs are evolved . animals either terrestrial or aquatic are adopted to different types of respiration and possess different types of respiratory organs mostly depending on the habitat in which they live.
Body size, availability of water and the type of their circulatory system are some of the reasons for the animals to develop different types of respiratory organs.
There is tracheal respiratory system in insects like cockroach, grasshopper etc...
Tracheal respiratory system consists of series of tubes called trachea .this is divided into fine branches called tracheols which carry air directly to the cells in the tissues.
Some aquatic animals like fishes have developed special organs for respiration which are known as gills or branchiae . blood supplied to gills through capillaries which have thin walls where gases are exchanged .this is called branchial respiration .fish keeps it's mouth is closed and the floor outside will be drawn into the oral cavity .now the mouth is closed and the floor of the oral cavity is raised . water is pushed into the pharynx and is forced in to the gill pouches through internal branchial apertures.gill lamellae are bathed with water and gaseous exchange takes place.
Respiration through skin is called cutaneous respiration .frog an amphibian can respire through cutaneous and pulmonary respiration process as well as bucco pharyngal cavity.terrestrial animals like reptiles, birds and mammals,respire through lungs.ask your teacher how crocodiles and dolphins respire?

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