Question

Fill the blanks:
1. Our nose has hair and _________ to clean, moisten and warm the air.
2. Our throat contain two pipes one for the food and other for the ________.
3. Our lungs are the most important organ of the______.
4. Our ____ have no muscles.
5. There are more than ____ km of blood vessels in your lungs.
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Answer 1

Answer:

Scroll-shaped bones, the nasal conchae, protrude and form spaces through which the air passes. The conchae swirl the air around to allow the air time to humidify, warm, and be cleaned before it enters the lungs. Epithelial cilia (commonly called “nose hair”) and a mucous membrane line the inside of the cavities.