bronchial tree (respiratory tree) multiple-branched trachea, bronchi and lungs.

pulmonary hand drawn trachea airway pneumonia covid respiratory system medicine ventilation bronchial tubes tube tree lung biology body healthy symbol science human physiology vector life organ design pattern anatomy isolated breathe growth backgrounds bronchi people respiration illness tuberculosis asthma alveoli painting environment smoking lungs medical health care bronchitis branch multiple-branched drawing gouache paint sprinkles white lungs