Question 14 Marks
Breathing rate means the number of times a person breathes per minute. During breathing, inhalation and exhalation take place alternately. One inhalation plus one exhalation complete a single breath.
(i) Explain why the breathing rate increases during strenuous exercise?
(ii) When we exercise vigorously, the breathing rate increases and heart rate also increases. In this process, exhalation is also a very important part of exercise. Explain the importance of exhalation.
(iii) A teacher in the class assigned two students a task to compare the effect of physical activities on pulse rate. Students carried out a practical activity and collected class data. From this, they produced the graph above, which contains data at rest, brisk walking and fast running. Describe and explain the result of the investigation.
(iv) Suggest one aerobic breathing activity which can increase the capacity of lungs to take in more air.
Answer
View full question & answer→(i) Breathing rate increases during strenuous exercise because there is more muscle contraction which requires more oxygen to produce more energy.
(ii) When we exercise vigorously, the breathing rate increases, and heart rate also increases to meet the increased demand of energy by our muscles. In this process, exhalation is also very important part of exercise because it helps to get rid of carbon dioxide.
(iii) The graph produced shows that the two students got similar results because age of the students is similar. The graph also shows that the pulse rate increases with more vigorous exercise because of the need for more oxygen.
(iv) Running/swimming/cycling
(ii) When we exercise vigorously, the breathing rate increases, and heart rate also increases to meet the increased demand of energy by our muscles. In this process, exhalation is also very important part of exercise because it helps to get rid of carbon dioxide.
(iii) The graph produced shows that the two students got similar results because age of the students is similar. The graph also shows that the pulse rate increases with more vigorous exercise because of the need for more oxygen.
(iv) Running/swimming/cycling