MEDICAL
TRACHEA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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____ patrol the epithelium, phagocytizing dust or debris that has reached the alveolar sacs.
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Septal cells
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Surfacant
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Alveolar macrophages
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None of the above
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Explanation:
Detailed explanation-1: -Macrophages are effector cells of the innate immune system that phagocytose bacteria and secrete both pro-inflammatory and antimicrobial mediators.
Detailed explanation-2: -Alveolar macrophages (AM) also known as dust cells are a type of white blood cells. The immune system is divided into the cellular and humoral components. Alveolar macrophages are the first line of defense against invading respiratory pathogens.
Detailed explanation-3: -Alveolar macrophages patrol the alveolar air spaces and the interalveolar septa (interstitium, Fig. 10.16), passing freely between the two. They phagocytose inhaled debris (e.g. fine dust, including carbon), and are an important defence mechanism against inhaled bacteria.
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