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.⏎
Lipid - A broad group of molecules including fats and waxes that are insoluble in water and are an important part of living cells.⏎
Immune System - The system of biological structures and processes that protects the body from foreign substances, including pathogens.⏎
Infection - The entry, establishment, and replication of pathogens inside a host organism.⏎