Discussion
Skin, body hair, cilia, eyelashes, the respiratory tract and the gastrointestinal tract are examples of ________.
Answer: A
Correct answer: Physical barrier
These are all physical (anatomical) barriers: they block or sweep away invaders mechanically. Skin is a tough keratinised sheet, hair and eyelashes catch particles, cilia in the airways drive trapped material upwards, and the linings of the gut and respiratory tract present a continuous covered surface. They are the first line of defence and belong to innate immunity.
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