Question

match the following terms or phrases with the lines of defense in the human immune system.
note: labels may be used more than once.
first identifies self versus nonself
inflammation phagocytes
salivary enzymes specific response
antipathogenic skin antibodies
first line of defense
second line of defense
third line of defense

Explanation:

• First line of defense: Physical/chemical barriers (skin, salivary enzymes, antipathogenic substances).
• Second line of defense: Non-specific innate responses (inflammation, phagocytes).
• Third line of defense: Specific adaptive responses (self/nonself identification, antibodies, specific responses).

Answer:

First line of defense: salivary enzymes, antipathogenic, skin
Second line of defense: inflammation, phagocytes
Third line of defense: first identifies self versus nonself, specific response, antibodies