What structures are provided in the upper part of the respiratory tract to remove germs, dust, and other harmful particles from inhaled air in humans?
Show answer & explanation
Correct answer: D
Explanation
Cilia: Protective Shield of the Respiratory System -
Our trachea and nasal passages contain tiny, hair-like structures called cilia.
Function: The main function of cilia is to prevent dust particles, germs (bacteria/viruses), and other harmful substances from reaching the lungs.
Process: The walls of the respiratory tract produce a sticky substance called mucus. Dust and particles become trapped in this mucus, and the cilia, moving in a rhythmic motion, push this debris upward so it can be expelled through coughing or sneezing.