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Internal means factors or components within a business that can be controlled and external is the exact opposite. External factors, economy, competitors etc... Internal means something done from the inside and external means the opposite, something done from the outside.
Internal and External Respiration. There is a big difference between external and internal respiration. External respiration is basically the transfer of gas between respiratory organs such as lungs and the outer environment. It takes place prior to internal respiration. Internal respiration is the transfer of gas between the blood and cells. External respiration also known as breathing refers to a process of inhaling oxygen from the air into the lungs and expelling carbon dioxide from the lungs to the air. Exchange of gases both in and out of the blood occurs simultaneously.