Questions: Which line of defense consists of external barriers?
Which line of defense consists of external barriers?
Solution
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.