EduNinja• Investigate and describe the effects of physical activity on the rate and depth of breathing
A group of students planned an investigation to determine the effects of physical activity on breathing rate.
Describe how the students could measure their breathing rates.
The students measured their breathing rates before physical activity and every minute for five minutes after cycling around the school field.
Write a hypothesis for their investigation.
A student measured the rate and depth of breathing of an athlete for 30 seconds at rest. The data are shown in Fig. 3.2.
Fig. 3.2
Using the information in Fig. 3.2, calculate the rate of breathing at rest. breaths per minute
The measurements were repeated while the athlete was running on a treadmill.
The data are shown in Fig. 3.3.
Fig. 3.3
Using the information in Fig. 3.3, calculate the volume of air inspired in one breath from 25 seconds.
The graph shows the rate and depth of a person's breathing before exercise.
Which graph shows the rate and depth of breathing of the same person immediately after a period of exercise?
The graph shows changes in the volume of air in the lungs of a person at rest, over a period of 30 seconds.
Which graph shows changes in the volume of air in the lungs of the same person immediately after they have done five minutes of vigorous exercise?
A
C
The graph shows changes in the volume of air in the lungs of a person at rest, over a period of 30 seconds.
Which graph shows changes in the volume of air in the lungs of the same person immediately after they have done five minutes of vigorous exercise?
A
C
D
Scientists investigated the effect of increasing carbon dioxide concentration in the air on the rate and depth of breathing. The people who took part in the investigation were healthy volunteers.
The people breathed atmospheric air containing 0.04 % carbon dioxide for five minutes. They then breathed air containing 2 % carbon dioxide for five minutes and then returned to breathing atmospheric air for a further five minutes.
The results are shown in Fig. 5.1.
Fig. 5.1
key:
- rate of breathing
------- depth of breathing
Describe the effects of changing the carbon dioxide concentration of the air on the rate and depth of breathing, as shown in Fig. 5.1.
The diagrams show the depth and rate of breathing in a person at 12.00 pm and 1.00 pm .
What happens to the person's breathing between 12.00 pm and 1.00 pm ?
depth
of breathing
rate
of breathing
decreases
decreases
decreases
increases
increases
decreases
increases
increases