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 allergy anatomical anatomy asthmatic biological blood breath breathe bronchi bronchial bronchiole bronchus cavity circulate flu health healthy human illness inhale internal larynx lung man medicine organ person physiology pneumonia pollution protection purify respiration respiratory respire silhouette smoking tissue trachea tract vapor virus vitality xray