If R.Q. is $0.6$ in a respiratory metabolism, it would mean that

Carbohydrates are used as respiratory substrate

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Organic acids are used as respiratory substrate

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The oxidation of the respiratory substrate consumed more oxygen than the amount of

C O_{2}

released

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All of the above

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Solution

The correct option is D The oxidation of the respiratory substrate consumed more oxygen than the amount of $C O_{2}$ released
If R.Q.is $0.6$ in respiratory metabolism, it would mean that the oxidation of the respiratory substrate consumed more oxygen than the amount of $C O_{2}$ released.
The respiratory quotient (RQ) is the ratio:
RQ = $C O_{2}$ eliminated / $O_{2}$ consumed
From the formula, it is clearly understood that higher the amount of $C O_{2}$ released, higher the value of R.Q., higher the amount of $O_{2}$ consumed, lesser the value of R.Q.
So, the correct answer is option C.

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