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The Causes Of The Gas Exchange In Humans

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Gas exchange takes place at the respiratory surface which is a boundary between the external environment and the interior of the body. Respiratory surface is a cell membrane for the gas exchange of unicellular organisms but for the large organisms it has specialise organs like lungs, gills or trachea. Gas exchange is the exchange of gases across a semipermeable membrane via the process of diffusion, This occurs across cell membranes (from inside the lungs to blood stream then from out of the blood, into the cells, into the mitochondria). Gas exchange involves the respiration and breathing. Respiration is the process of combining oxygen with glucose to make energy into the form of ATP. This occurs inside the cells at the mitochondria. Breathing is the physical action of moving air into and out of the body or water over the surface of the gills. This occurs as a whole body or organ movement. We need gas exchange because all animals carry out respiration to release energy from the food. This process require oxygen gas and release of carbon dioxide gas. This means animals, must have an efficient system to obtain the oxygen from the atmosphere or water and to remove the carbon dioxide from their body. This provide us with oxygen for respiration process, efficient exchange of gases and allow diffusion of gases.

Diffusion is required to supply all organisms with oxygen. Factors affecting the rate of diffusion is the surface area therefore for the efficient of diffusion to

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