Final answer:
A lysosome is a chemical barrier that is part of the human body's innate immune response, working alongside other barriers like skin and mucous membranes to prevent infections.
Step-by-step explanation:
A lysosome is an example of a chemical barrier. The human body uses chemical barriers as part of the innate immune response to prevent and eliminate infections. Chemical barriers, such as lysozyme found in saliva, enzymes in sweat, and acid in the stomach, function by killing or inhibiting pathogens on body surfaces or within body secretions. In the digestive system, these barriers include the acidic environment of the stomach and the lysozyme in saliva which digests bacterial cell walls. The innate immune response features important components like the skin and mucous membranes, which act instantaneously to prevent pathogenic invasion, and also includes a range of specialized cells and soluble factors that are activated once pathogens breach these barriers.