Air circulation in the lungs

lung ventilation, respiratory system, air flow, breathing process, oxygen intake, carbon dioxide removal, pulmonary circulation, alveoli function, respiratory health, lung function, airflow in lungs, inhalation, exhalation, respiratory mechanics, pulmonary ventilation, oxygen exchange, gas exchange, lung capacity, respiratory efficiency, airway flow, respiratory physiology, lung breathing, air passage, pulmonary function, breathing cycle, respiratory airflow, oxygen transport, lung respiration, respiratory movement, alveolar ventilation, gas transport, airway circulation, breathing mechanism, lung oxygenation, respiratory system function, pulmonary gas exchange, air distribution, lung health, respiratory rate, breathing efficiency