How the rate of breathing is increased ?
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When you do some physical work......
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Procedure:
1. Sit still for a few minutes and count how many breaths you take per minute. Note down in your notebook.
2. Now walk for five minutes and then note how many breaths you take per minute.
3. Next, run three times and then again note the number of breaths per minute.
Observation: You will observe that the breathing rate is Highest after running.
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