| (i) How many breaths per minute is the person taking when at rest? |
| (ii) Which two points in the graph (C, D, E or F), shows inspiration and expiration? |
A)
i-5 ii-D, E
B)
i-15 ii-D, F
C)
i-15 ii-C, D
D)
i-20 ii-E, F
Correct Answer: B
Solution :
(i) It is clear from the given graph that the person is taking 5 breaths per 20 sec, so in 1 minute (60 sec) he will take 15 breaths \[\left( \frac{5}{20}\times 60 \right)\] (ii) Point 'D' shows increase in the volume of lungs, thus at this point, inspiration is taking place while point 'F' shows decrease in the volume of lungs, thus at this point, expiration is taking place.
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