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www.GOALias.blogspot.comcarbon dioxide is known as exhalation.It is a continuous process which goeson all the time and throughout the lifeof an organism.The number of times a personbreathes in a minute is termed as thebreathing rate. Both inhalation andexhalation take place. A breath meansFig. 10.2 Holding breathBoojho noticed that when hereleased his breath after holdingit for some time, he had tobreathe heavily. Can you tellhim why it was so?one inhalation plus one exhalation.Would you like to find out yourbreathing rate? Do you want to knowwhether it is constant or it changesaccording to the requirement of oxygenby the body? Let us find out by doingthe following activity.Activity 10.2Generally we are not aware that we arebreathing. However, if you try you cancount your rate of breathing. Breathein and out normally. Find out how manytimes you breathe in and breathe outin a minute? Did you inhale the samenumber of times as you exhaled? Nowcount your breathing rate (number ofbreaths/minute) after brisk walk andafter running. Record your breathingrate as soon as you finish and also aftercomplete rest. Tabulate your findingsand compare your breathing rates underdifferent conditions with those of yourclassmates.From the above activity, you musthave realised that whenever a personneeds extra energy, he/she breathesfaster. As a result more oxygen isTable 10.1 Changes in breathing rate under different conditionsName of the classmateNormalBreathing rateAfter a briskAfter runningwalk for 10fast 100 mminutesAt restSelf110SCIENCE