What Is the sum total of all of the chemical reactions in the body that break substances down and build them up.?

The sum total of all chemical reactions in the body that break substances down and build them up is known as metabolism. Metabolism is divided into two main processes: catabolism, which involves breaking down molecules to release energy, and anabolism, which involves building up molecules to store energy. Together, these processes are essential for maintaining life, supporting growth, and providing energy for cellular activities.