Mucous Membrane - The moist linings of body passages and internal cavities involved with absorption and secretion of substances.⏎
Morbidity - The relative occurrence of a disease or a condition that causes illness.⏎
Metabolism - The sum total of chemical reactions that occur within a living cell both to build new molecules within the cell and break down and assimilate sources of energy for the cell.⏎
Infection - The entry, establishment, and replication of pathogens inside a host organism.⏎