Trace the flow of Blood from the heart to the lungs?

Alveolus---> alveolar/capillary walls----> pulmonary vein----> left

atrium----> bicuspid (mitral) valve----> left ventricle----> aortic semilunar valve----> aorta----> systemic arteries-----> capillary beds of

tissues-----> systemic veins-----> superior or inferior vena cava-----> right atrium----->tricupid valve----->right ventircle.