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A productive efficient society
Replacement Request
A formal or informal request to replace something that is lost, damaged, unsatisfactory, or no longer meets the needs.
External Respiration
The exchange of gases (oxygen and carbon dioxide) between the atmosphere and the blood through the lung alveoli.
Pulmonary Ventilation
The process of moving air in and out of the lungs to facilitate gas exchange with the internal environment, mainly by bringing in oxygen and flushing out carbon dioxide.
Internal Respiration
The exchange of gases (oxygen and carbon dioxide) between the blood and the body cells, facilitating cellular metabolism.
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