Questions: Which line of defense consists of external barriers?

Which line of defense consists of external barriers?

Solution

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The answer is the second one: First.

Explanation:

  • First Line of Defense: This consists of external barriers such as skin and mucous membranes that prevent pathogens from entering the body.
  • Second Line of Defense: This involves internal mechanisms like inflammation, fever, and phagocytic white blood cells that respond to pathogens that have bypassed the first line.
  • Third Line of Defense: This is the adaptive immune response, involving lymphocytes and antibodies that target specific pathogens.

Summary: The first line of defense consists of external barriers.

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