When there is a decrease in the concentration of oxygen in the blood, the rate of breathing

Does not change

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Increases

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Decreases

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Increases or decreases depending on the density of blood

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Solution

The correct option is A Increases
When the level of Oxygen in blood decreases, the breathing rate increases so as to take in more Oxygen required for metabolic functions.
So, the correct option is "B" (Increases).

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When there is a decrease in the concentration of oxygen in the blood, the rate of breathing

The correct option is A IncreasesWhen the level of Oxygen in blood decreases, the breathing rate increases so as to take in more Oxygen required for metabolic functions.So, the correct option is "B" (Increases).

The correct option is A Increases
When the level of Oxygen in blood decreases, the breathing rate increases so as to take in more Oxygen required for metabolic functions.
So, the correct option is "B" (Increases).