ventilation: movement of air into and out of the lungs. External respiration: gas exchange between air in lungs and blood. transport of oxygen and carbon dioxide in the blood. Internal respiration: gas exchange between the flood and tissues. The function of respiration: ATP synthesized by aerobic metabolism is 20 times larger than the common anaerobic pathways leading to lactic acid.
20 percent of air is oxygen as you know. Oxygen uptake is accompanied by an euqivalent CO2 excretion. Small animals do not require any specialized respiratory structures for oxygen uptake or carbon dioxide loss or an internal circulatory system. A larger body size decreases the body surface area available for respiratory exchange relative to body mass.
The evolution of larger and metabolically more active animals is associated with progressively more complex respiratory structures specialized for gas exchange.
respiratory system summary
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