A. 6
B. 12
C. 24
D. 32 (more…)
Presence of cartilaginous rings in respiratory tract sct as:
A. Support
B. Keep passage open
C. Prevent collapsing
D. All of the above
The distribution of air into lungs is controlled by:
A. Bronchi
B. Bronchioles
C. Air sacs
D. All of these
Which can response to changes in their envoirnment.
A. Living Organism
B. Non-Living Organism
C. Both a and b
D. None of them
The total number of Cingula in each dentition is________ ?
Each day human body breathe in ___ litres of air.
A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000
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