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The given graph shows how the rate of br...

The given graph shows how the rate of breathing of a person changes under different conditions. At the beginning of each experiment, the person is breathing in atmospheric air.

What conclusion may be derived from the graph?

A

High level of oxygen in the air causes breathing rate to drop, regardless of carbon dioxide level.

B

Increase in carbon dioxide level in air causes breathing rate to increase upto a limit.

C

Breathing rate is controlled only by oxygen content of air and is independent of carbon dioxide concentration.

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Rate of breathing of a person depends on the concentration of carbon dioxide in the atmosphere. Increase in carbon dioxide level in air causes breathing rate to increase upto a limit. Oxygen does not have significant direct effect on the respiratory centres of the brain in controlling respiration.
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