lungs one line art. continuous line drawing of human, internal, organs, lungs, bronchi, trachea, alveoli, bronchioles.

human internal organs lungs bronchi trachea alveoli bronchioles one line ontinuous drawing hand vector continuous medicine healthy sketch concept tuberculosis day single anatomical tobacco silhouette no smoking world health respiratory illness care lung medical sign pulmonary science cancer icon anatomy biology stop body organ breathe coronavirus doodle simple shape chest