Which substance is considered a major source of energy for the body?

Glucose is considered a major source of energy for the body because it is a simple sugar that is readily absorbed into the bloodstream and transported to cells throughout the body. Once inside the cells, glucose undergoes a series of metabolic processes, primarily glycolysis and cellular respiration, which convert it into adenosine triphosphate (ATP), the energy currency of the cell. This process is fundamental to providing the energy required for various bodily functions, including muscle contraction, nerve impulse transmission, and cellular repair.

While other substances like glycogen also play essential roles in energy metabolism—serving as a storage form of glucose in the liver and muscles—the immediate source of energy utilized by cells is glucose itself. Hormones such as glucagon help regulate blood glucose levels but are not direct sources of energy. Glucomin, on the other hand, is not a recognized term in the context of energy sources for the body. Understanding the role of glucose and its metabolism is crucial in situations such as managing diabetes and ensuring adequate energy supply during physical activity.