14. The taking in, and giving out, of air is called external respiration or breathing.
Breathing consists of inhalation and exhalation. It continues throughout the life of an
individual.
a) What is the meaning of one 'breath'?
b) How does diaphragm help in breathing?
c) Define 'breathing rate'.
d) Explain the movement of muscles around rib cage during inspiration.
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a) breath means taking oxygen in and giving out which means respiration.
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