MRCP UK EXAMINATIONS

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NEUROLOGY

SURGERY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
____ depresses the activity of scavenger cells and affects the respiratory tract’s ciliary cleansing mechanism, which keeps breathing passages free of inhaled irritants, bacteria, and other foreign matter.
A
spirometry
B
smoking
C
bullectomy
D
None of the above
Explanation: 

Detailed explanation-1: -The mucus layer traps pathogens (potentially infectious microorganisms) and other particles, preventing them from reaching the lungs. Cilia beat more than 1, 000 times a minute, moving the mucus that lines the trachea upwards about 0.5 to 1 centimeter per minute (0.197 to 0.4 inch per minute).

Detailed explanation-2: -Cilia, tiny muscular, hair-like projections on the cells that line the airway, are one of the respiratory system’s defense mechanisms. Cilia propel a liquid layer of mucus that covers the airways.

Detailed explanation-3: -The human lung has an exquisitely effective and complex defense against infections. Mucus prevents attachment of bacteria to the epithelium, and those bacteria that cannot cross the mucus are cleared by exhalation or by the mucus-ciliary escalator.

Detailed explanation-4: -Pseudo stratified columnar epithelium: It protects passages of the respiratory system. It contains cilia that move mucus over the surface of the tissue.

There is 1 question to complete.
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