How many of the stated functions are performed by conducting part of human respiratory system?
(a) Clearing the incoming air by trapping dust particles present in it.
(b) Diffusion of O2 and CO2 between blood and atmospheric air.
(c) Conducting air from external nostrils upto bronchioles.
(d) Bringing the temperature of air upto the body temperature.
(e) Making the incoming air humid by providing moisture produced by epithelium of nasal cavities.
(f) Transporting the atmospheric air to the alveoli.
1. Six
2. Four
3. Five
4. Three
Subtopic:  Respiratory System: Upper Respiratory Tract | Respiratory System: Trachea & Basic Anatomy of Lung |
From NCERT
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NEET 2026 - Target Batch - Vital
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To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital

Read the following statements and choose the correct option :
A. Bacteria that reach the lungs, rarely survive.
B. Alveoli of normal lungs are lined by a film of lecithin which kills bacteria.
1. Statement A is correct and B incorrect
2. Statement B is correct and A incorrect
3. Both the statements are correct
4. Both the statements are incorrect
Subtopic:  Respiratory System: Upper Respiratory Tract | Respiratory System: Trachea & Basic Anatomy of Lung |
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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