digestive system?

Question

Individuals on low-fat, low-protein diets obtain the bulk of their energy needs from
carbohydrates. Complex carbohydrates such as starch and disaccharides such as sucrose
(table sugar) are first broken down into glucose. Through a series of metabolic reactions and
pathways, the glucose is completely converted to CO2, and the energy it contains is used to
produce glucose. Describe this process in detail.

Answer 1

http://en.wikipedia.org/wiki/Glycolysis
http://en.wikipedia.org/wiki/Citric_acid_cycle

that's a pretty good start...