GASEOUS EXCHANGE Grade 11 Life Sciences B) Key Concepts What is Gaseous Exchange? The main function of the respiratory system is to take in oxygen from the atmosphere and make it available to the cells for cellular respiration. Carbon dioxide is produced during respiration and must be removed. Terms that are important that you can differentiate between: o Breathing – the mechanical process whereby air moves into and out of the lungs. (inhalation and exhalation) o Gaseous exchange – the exchange of oxygen and carbon dioxide across a gaseous exchange surface. o Cellular respiration – the release of energy from glucose in the presence of oxygen Requirements of an Effective Gaseous Exchange Surface: To enable oxygen and carbon dioxide to diffuse through it easily, it must be: Large – to ensure the maximum exchange of gases can take place. Thin and permeable – so that diffusion can take place easily and rapidly. Moist – so that gases can dissolve to form a solution. Well ventilated – good oxygen supply and carbon dioxide removal. (maintain a diffusion gradient) Efficient transport system – for effective transport of gases. Well protected - to prevent desiccation (drying out) and mechanical injury.
Posted on: Wed, 17 Jul 2013 15:10:08 +0000
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