Textbook Question
Mucus-secreting membranes are found in:
a. The urinary system
b. The digestive cavity
c. The respiratory passages
d. All of the above
19. Innate Immunity
Physical Barriers in First-Line Defenses: Mucous Membrane
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which physical, nonspecific host defense mechanism is associated with the respiratory tract and trachea?
A
Water-repelling keratin proteins.
B
Lysozyme enzymes.
C
Mucociliary escalator.
D
Salivary amylase.
Verified step by step guidance1
Understand the role of the mucociliary escalator: It is a defense mechanism in the respiratory tract that helps to trap and move particles and pathogens out of the airways.
Recognize the components of the mucociliary escalator: It consists of mucus-producing goblet cells and ciliated epithelial cells lining the respiratory tract.
Learn how the mechanism works: The mucus traps inhaled particles and microorganisms, while the cilia beat in a coordinated manner to move the mucus upwards towards the throat.
Identify the location: The mucociliary escalator is primarily found in the trachea and bronchi, which are parts of the lower respiratory tract.
Differentiate from other mechanisms: Unlike enzymes like lysozyme or proteins like keratin, the mucociliary escalator is a physical mechanism that relies on the movement of cilia and mucus to protect the respiratory system.
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