Dalam biokimia , lintasan metabolisme ( bahasa Inggris : metabolic pathway ) adalah reaksi kimiawi yang terjadi di dalam sel . In each pathway, a principal chemical is modified by chemical reactions . Enzymes catalyze these reactions, and often require dietary minerals, vitamins, and other cofactors in order to function properly. Because of the many chemicals that may be involved, pathways can be quite elaborate. In addition, many pathways can exist within a cell. This collection of pathways is called the metabolic network . Pathways are important to the maintenance of homeostasis within an organism .