<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Respiratory Secretion Alteration involves a change in the quality of the existing state of fluid release from cells in the respiratory tract. Such alterations increase or decrease the surfactant, protective, and lubricating effects of respiratory secretions.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>