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The given graph shows the changes in the...

The given graph shows the changes in the volume of the lungs of a person at rest over a period of 20 seconds.

(i) How many breaths per minute is the person taking when at rest?
(ii) Which labels (C, D, E or F) in the given graph show inspiration and expiration respectively?

A

`{:("(i)","(ii)"),(5,"D,E"):}`

B

`{:("(i)","(ii)"),(15,"D,F"):}`

C

`{:("(i)","(ii)"),(15,"C,D"):}`

D

`{:("(i)","(ii)"),(20,"E,F"):}`

Text Solution

Verified by Experts

The correct Answer is:
B
(i) It is clear from the given graph that the person is taking 5 breaths per 20 sec.
So in 1 minute (60 sec) the person will take
`=((5)/(20) xx 60)` breaths = 15 breaths.
(ii) Line .D. shows gradual increase in the volume of lungs, thus it indicates inspiration while line .F. shows gradual decrease in the volume of lungs, thus it indicates expiration.
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