<prompt> What can be the non-respiratory functions of lungs:Sodium balance.Fibrinolytic function.Secretion of heparin.All of the above.  <response>: NON respiratory function of lung: ACE synthesized by lung Na balance. Fibrinolytic function Pulmonary Endothelium is rich in PLASMIN activator. Heparin Lung is rich in mast cells which secrete heparin. SURFACTANT Synthesized by type 2 alveolar epithelial cells. 