Question

The mucocilliary escalator in the respiratory epithelium is responsible for ----------- o increasing the production of mucus during an infection enhancing movement of air in and out of the bronchi o preventing foreign materials from reaching the lungs chemotaxis that attracts neutrophils during an infection Moving to the next question prevents changes to this answer.

Answer 1

The correct answer is prevent foreign materials from reaching the lungs. Mucociliary escalator is what is defence mechanism to prevent any harmful foreign particles to enter into the respiratory tract trying to invade the lungs. Out of the two mechanism to prevent foreign particles from entering the lungs mucociliary escalator is one. This mechanism prevents the already inhaled foreign particles that gets trapped in nasal region from further entering the lung. The cilia and mucus of goblet cells push the foreign particles into the throat that can be either swallowed or or ejected out through cough.

1. Excess mucus production occurs only in case of pathogenic infection not in case of foreign particles. This usually leads to nasal congestion and sore throat.

2.Mucociliary escalator causes the the movement of foreign particles that sticks to the mucus lined nasal cavity into the throat.

4.Chemotaxis occurs when harmful viral chemicals or bacterial antigens are detected by the nasal cavity.

Thus these options are incorrect.

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