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.
skin inflammation salivary enzymes
antibodies specific response
antipathogenic
first identifies self versus nonself
phagocytes
first line of defense
second line of defense
third line of defense

Explanation:

• First line of defense: Physical/chemical barriers (skin, salivary enzymes).
• Second line of defense: Nonspecific responses (inflammation, phagocytes, antipathogenic actions).
• Third line of defense: Specific immune responses (antibodies, specific response, self/nonself identification).

Answer:

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