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Metabolic connections

The main connection between metabolic pathways is that catabolic reactions produce energy or ATP which is then used by anabolic reactions.

Diagram showing catabolic and anabolic reactions and the connection between them. Catabolism, energy yielding metabolism, is the reaction category on the left. In catabolic reactions, energy sources yield heat, metabolic products, and utilisable energy in the form of ATP. This ATP is picked up for use in anabolism, biosynthetic metabolism, the reaction category on the right. Anabolic reactions use ATP and external nutrients to ultimately produce usable biopolymers. After ATP is de-phosphorylated to ADP, it cycles back to catabolic reactions, where it can be phosphorylated again.

Other connections take place between different substrates and products in certain metabolic pathways, for instance, between the different catabolic routes.

Referred from:

Article
Metabolic pathways
Article
Metabolism