Respiration takes place by the diffusion of gases through the body surface.The gaseous exchance i,e intake of oxygen and giving out of carbondioxide takes place between the blood capillaries of the outer epidermis and the surface film of moistures contributed by secreated mucus excreated wastes and coelomic fluid.Haemoglobin dissolved in the plasma of blood acts as a respiratory pigments transporting oxygen to the body tissues.
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