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Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
3. Oxygen: Oxygen is crucial to sustaining life. Though it varies from person to person, on an average, 3 minutes is the maximum time where the person can stay alive without oxygen. Yoga and meditation experts may hold breath for longer than this, but these are very rare examples.. Oxygen: Oxygen is crucial to sustaining life. Though it varies from person to person, on an average, 3 minutes is the maximum time where the person can stay alive without oxygen. Yoga and meditation experts may hold breath for longer than this, but these are very rare examples.