i.
The living body requires constant supply of energy.
ii.
This energy in the form of ATP is released through
oxidation of glucose in each cell.
iii.
For this oxidation, constant supply of oxygen is
needed which is obtained through breathing.
iv.
When vigorous exercise is done, there is more need
of ATP and thus more oxygen is required for the cellular respiration.
v.
To make available to this increased demand the
breathing rate increases during vigorous exercising.
