BIO 203 Lecture Notes - Lecture 17: Teleost, Pneumothorax, Bronchiole
18 Jun 2019
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Document Summary
The movement of gases (oxygen and carbon dioxide) between the external environment and the cells of the organism. External respiration: major function of external respiration is gas exchange. Discharge of co 2 into environment: another major function is acid-base balance, animals require continuous supply of o 2, environmental reservoirs of oxygen. Bodies of water also contained dissolved o 2: o 2 is not very soluble in water. Respiratory surfaces: cutaneous respiration : small or thin animals can use their body surface for gas exchange. O 2 diffuses very slowly through water (about 3 million times slower than. All cells must be close the respiratory surface (< 1mm) through air) In large animals, the body surface does not have enough area to support all of the cells. In many animals a closed circulatory system with one or more hearts serves as a transport medium between cells and a specialized respiratory system.
