Question
Define RQ. What is its value for fats?
✓
Answer
During oxygen respiration, $O _2$ is used and $CO _2$ is released. The ratio of $CO _2$ released during respiration and $O _2$ used is called Respiratory Quotient $=$ R.Q.
$RQ =\frac{\text { Volume of } CO _2 \text { evolved }}{\text { Volume of } O _2 \text { consumed }}$
The respiration coefficient of fats is always less than one. Fats contain less amount of $O _2$ than carbohydrates, hence their oxidation requires more $O _2$ from an external source. Apart from this, fats generally do not undergo direct oxidation. First, they undergo hydrolysis to form fatty acids and glycerol, in which some amount of $O _2$ is also used. Therefore, due to these reasons the value of fats is less than one.
$\begin{array}{c}2\left( C _{51} H _{98} O _6\right)+1450_2 \longrightarrow 102 CO _2+98 H _2 O +\text { Energy } \\ RQ =\frac{102 CO _2}{145 O _2}=0.7\end{array}$
$RQ =\frac{\text { Volume of } CO _2 \text { evolved }}{\text { Volume of } O _2 \text { consumed }}$
The respiration coefficient of fats is always less than one. Fats contain less amount of $O _2$ than carbohydrates, hence their oxidation requires more $O _2$ from an external source. Apart from this, fats generally do not undergo direct oxidation. First, they undergo hydrolysis to form fatty acids and glycerol, in which some amount of $O _2$ is also used. Therefore, due to these reasons the value of fats is less than one.
$\begin{array}{c}2\left( C _{51} H _{98} O _6\right)+1450_2 \longrightarrow 102 CO _2+98 H _2 O +\text { Energy } \\ RQ =\frac{102 CO _2}{145 O _2}=0.7\end{array}$
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