The main function of the respiratory system is to exchange oxygen and carbon dioxide gases within the body. The respiratory system allows for the intake of oxygen from the atmosphere, which is essential for cellular respiration, and the expulsion of carbon dioxide, a waste product of metabolic processes. While the respiratory system does play a role in protecting the body against pathogens and is involved in other functions, its primary and most critical role is gas exchange.
The diagram below shows the lungs which are the main organs in the respiratory system. What is the main function of the respiratory system with the answer be to protect the body against poor substances, such as bacteria and viruses to break down food into nutrients that can be circulated throughout the body or to exchange oxygen and carbon dioxide gases within the body or to sand signals from one part of the body to other parts of the body.
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