2. Complete Activity 6.2 (Page 59). Generally we are not aware that we are breathing. However, if you try you can count your rate of breathing. Breathe in and out normally. Find out how many times you breathe in and breathe out in a minute? Did you inhale the same number of times as you exhaled? Now count your breathing rate (number of breaths/minute) after brisk walk and after running. Record your breathing rate as soon as you finish and also after complete rest. Tabulate your findings and compare your breathing rates under different conditions with those of your classmates.
Answer:
The Activity 6.2 should be carried out along with your classmates in the following way:
Aim: To know if your breathing rate remains constant or changes according to the requirement of oxygen by your body.
Materials Required: None
Procedure:
(i) Breathe in and out normally. Observe if you inhaled the same number of times as you exhaled during this period. Then record the number of breaths you take in one minute. This is your breathing rate.
(ii) Then record your breathing rate right after taking a brisk walk for 10 minutes and also after complete rest.
(iii) Next record your breathing rate right after running fast for 100 m and also after complete rest.
(iv) Your classmates should also carry out the activity on their own. Tabulate your findings and compare your breathing rates under the different conditions with those of your classmates.
Observation:
You will observe that in each case the number of times you inhaled and the number of times you exhaled will be equal. The completed Table 6.1 is shown below:
Table 6.1 Changes in breathing rate under different conditions
| Name of the classmate | Breathing rate | |||
| Normal | After a brisk walk for 10 minutes | After running fast 100 m | At rest | |
| Ramesh | 20 | 24 | 29 | 20 |
| Riya | 18 | 21 | 28 | 18 |
| Sachin | 21 | 25 | 27 | 21 |
| Anisa | 20 | 23 | 30 | 20 |
| Self | 17 | 21 | 25 | 17 |
Conclusion: The exact breathing rate varies from person to person in each case.
After a brisk walk for 10 minutes the breathing rate will be higher than normal because the oxygen level in the body in the body gets depleted during the exercise and needs to be restored.
After running for 100 m the breathing rate will be higher than the breathing rate after walking. During running more energy is spent than during walking which depletes the oxygen level in the body even more and so the normal oxygen level needs to be restored via more rapid breathing.
Thus, we can conclude that the breathing rate changes according to the oxygen requirement of the body.
“Complete Activity 6.2 (Page 59). Generally we are not aware that we are breathing. However, if you try you can count your rate of breathing. Breathe in and out normally. Find out how many times you breathe in and breathe out in a minute? Did you inhale the same number of times as you exhaled? Now count your breathing rate (number of breaths/minute) after brisk walk and after running. Record your breathing rate as soon as you finish and also after complete rest. Tabulate your findings and compare your breathing rates under different conditions with those of your classmates.” – Solved.
Related Links:
Solution to Extended Learning Question 1
Solution to Extended Learning Question 2
Solution to Extended Learning Question 3
Solution to Activity 6.1
Solution to Activity 6.3
Solution to Activity 6.4
Solution to Activity 6.5
Solution to Activity 6.6
Solution to Chapter 6 Respiration in Organisms
