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The respiratory system is the anatomical system of an organism that introduces respiratory gases to the interior and performs gas exchange. In humans and other mammals, the anatomical features of the respiratory system include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood.
Diffusion of O2 and CO2 occurs at the alveoli in the lungs.
by diffusion across a capillary wall
by diffusion across a capillary wall
Insects have a unique respiratory system made up of small tubes called tracheae. The tracheae connect all parts of the body to small openings on the surface of the insect. Oxygen and carbon dioxide are transported through the tracheae (which the site of gaseous exchange) and from the tracheae to the blood of the insect by diffusion.
The lungs
diffusion
in the lungs
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hydra has no specialized respiratory organs and exchanges of gases take place via simple diffusion from surface lining of the enteron on so in this way the surface lining of enteron acts as an efficient respiratory surface
Gas exchange occurs in the alveoli in the respiratory system. The thin-walled structures allow diffusion of gases into and out of the capillaries.
Gaseous exchange occurs in the alveoli (singular = alveolus) of the lungs.