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SCIENCE

Paper 3 (Biology) - 2000

(One Hour and a half)


Question 4
(a) The volume of air in the lungs and the rate at which it is exchanged during inspiration and expiration is measured with a spirometer. The following diagrams shows the spirogram of lung volumes and capacities. Study the graph carefully and explain briefly the following:

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1.

(i) Tidal volume (TV)
 

2.

(ii) Inspiratory reserve volume (IRV).
 

3.

(iii) Expiratory reserve volume (ERV).
 

4.

(iv) Vital capacity (VC).
 

5.

(v) Residual volume (RV)
 


 
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