Answer :
Final answer:
Coughing and sneezing function as physical barriers to expel pathogens.
Explanation:
Coughing and sneezing act as physical barriers that help expel pathogens from the body. They are part of the mechanical defenses that protect against infection and disease.
Other examples ofphysical barriers include the skin, saliva, tears, and mucus, as well as cilia in the respiratory tract.
These barriers play a crucial role in preventing pathogens from entering the body tissues, constituting the body's first line of defense.
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