Question

With more demanding exercises (eg. running) more energy is needed and

therefore also more oxygen is needed (in the citric acid cycle) and more

carbon dioxide is produced. Therefore the heart and breathing rate is

becoming higher to enable the transportation of carbon dioxide and oxygen.

Normal resting heart rate for an untrained man is 70 - 75 bpm. And it's lower

for people that are well trained, it can be low as 25 bpm. And for old people it

is higher. Normal breathing rate/min is 13 - 16

Read the passage and observe the graph given above

Answer the following qestions:

7.1. What could be the reason of the breathing rate of person 2 after activity to be

lower than person 1 after activity?

7.2. Define breathing rate.

7.3. What are the gases being transported and what is the substance responsible

for the transport?

7.4. In whom do we generally observe high breathing rate even at rest?​

Answer 1

Answer:

During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.