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Multiple Choice
Which of the following prevents the alveoli from collapsing?
A
Pleural fluid
B
Surfactant
C
Cilia
D
Mucus
Verified step by step guidance
1
Understand the function of alveoli: Alveoli are tiny air sacs in the lungs where gas exchange occurs. They need to remain open to facilitate the exchange of oxygen and carbon dioxide.
Identify the role of surfactant: Surfactant is a substance produced by the cells in the alveoli. It reduces surface tension within the alveoli, preventing them from collapsing.
Consider the role of pleural fluid: Pleural fluid is found between the layers of the pleura surrounding the lungs. It helps reduce friction during breathing but does not directly prevent alveoli from collapsing.
Evaluate the function of cilia: Cilia are hair-like structures that line the respiratory tract, helping to move mucus and trapped particles out of the airways. They do not play a role in preventing alveolar collapse.
Assess the role of mucus: Mucus traps particles and pathogens in the respiratory tract, aiding in their removal. It does not prevent alveoli from collapsing.