- Circulation -

nasal & oral cavity → airway → trachea → bronchia → pulmonary tree →

alveolus → punmonary venule → pulmonary vein → left cadium → left ventricle →

Aortic arch → artery → arteriole → caphillary → venule → vein →

superior & inferior vena cava → right cadium → right ventricle →

pulmonary artery → pulmonary arteriole → caphillary → Co2-out , O2-in

pulmonary venule → pulmonary vein → left atrium → left ventricle → retune



- Systemic Circulation -

left ventrcle → Aortic arch → artery → arteriole → caphillary →

venule → vein → superior & inferior vena cava → right atrium



- Pulmonary Circulation -

right ventricle → pulmonary artery → pulmonary arterior → caphillary →

pulmonary venule → pulmonary verin → left atrium