2.During inhalation, the diaphragm is contracted which increases the volume of the lungcavity. During exhalation, the diaphragm is relaxed which decreases the volume of thelung cavity. The given graph is related to the changes in the volume of lungs of a person at a rest over a period of 20 seconds.
Question
(iii)During vigorous exercise, the
rate of breathing of normal man is
(a) 20 to 25 times per minute
(b) 50 to 90 times perminute
(c) 100 to 150 times per minute
(d) 40 to 70 times per minute.
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Class 10 science
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2021-12-19T08:53:54+00:00
2021-12-19T08:53:54+00:00 1 Answer
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Answer ( 1 )
Answer. (a) 20 to 25 times per
minute