Final answer:
The primary defense against infection is intact skin. Inflammation and phagocytosis are also important mechanisms of the innate immune system.
Step-by-step explanation:
Innate Immune System
The primary defense against infection is intact skin. Skin acts as a physical barrier that prevents pathogens from entering the body tissues. It is a part of the body's most basic defense mechanisms, continuously working to protect against a broad range of pathogens.
Inflammatory Response
Inflammation is an ongoing condition in the human body and is part of the innate immune response. It establishes a physical barrier against the spread of infection, eliminates the initial cause of cell injury, and initiates tissue repair.
Phagocytosis
Phagocytosis is the process of engulfing and digesting pathogens by specialized cells of the immune system. It is an essential mechanism for destroying pathogens after they enter the body.