Sharing is not just caring, it's also about giving credit - add this image to your page and give credit to the talented photographer who captured it.:
air alveolar alveoli alveolus anatomy asthma blue breathe bronchi bronchial bronchitis bronchus care chronic disease ducts education emphysema exchange gas health healthy human illustration inhalation lung lungs medical medicine oxygen pneumonia pulmonary pulmonis respiration respiratory sacs science structure system tree