<prompt> The surfactant is secreted by:Type 1 PneumocyteType 2 PneumocyteEpithelial cellsMacrophage  <response>: PneumocyteTypes of PneumocyteFunctionPneumocyte I 90-95Gas exchange between alveoli and bloodRefer: Ganong;s Review of Medical physiology 24th edition, pg no: 624 