In digestion, we learnt that the glucose is absorbed by villi and transported to all the cells in the body. Given that glucose is a six carbon compound, it is broken down to___ , a three-carbon compound in every cell to release energy. This energy is utilized by the cells for bodily functions.

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Solution

The glucose obtained by every cell is a carbon compound but not a form of energy that can be directly utilized by the body. So, it is broken down into pyruvate which is a 3 carbon compound to release energy.
$C_{6} H_{12} O_{6} \to 2 P y r u v a t e + 2 A T P + 2 N A D H$
The ATP and NADH are energy molecules which can be used by the cells.
Pyruvate further undergoes a cycle of changes to release more energy and carbon dioxide. The energy obtained in this process is utilized by the cells.
$P y r u v a t e \to 6 C O_{2} + E n e r g y$

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