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The upper part of the respiratory tract is provided with small hair-like structures called ______.
bronchi
cilia
villi
alveoli
- The upper part of the respiratory tract is equipped with tiny hair-like structures known as cilia.
- Correct Answer: Option 2 - Cilia
- Cilia help in moving mucus and trapped particles out of the respiratory system.
- Option 1 - Bronchi
- Bronchi are the main passageways in the lungs that branch from the trachea into the lungs themselves.
- Option 3 - Villi
- Villi are small, finger-like projections found in the small intestine, not related to the respiratory tract.
- Option 4 - Alveoli
- Alveoli are tiny air sacs in the lungs where gas exchange occurs.
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