How does metabolism work?
Metabolism is the set of biochemical processes that occur within an organism to maintain life. It involves the conversion of nutrients into energy and the building and breaking down of molecules necessary for cellular function. There are two main types of metabolism: catabolism and anabolism.

Catabolism is the breakdown of molecules, typically larger molecules, into smaller ones, which releases energy. This process involves the breaking down of complex molecules, such as proteins, carbohydrates, and fats, into their constituent parts. This energy is used to fuel cellular processes such as movement and the maintenance of body temperature.

Anabolism is the process by which smaller molecules are combined to form larger, more complex molecules, which requires energy. This process involves the synthesis of molecules such as proteins, nucleic acids, and glycogen. Anabolic reactions typically occur when energy is abundant and the body needs to store excess energy for later use.

The rate of metabolism is influenced by a number of factors, including genetics, body composition, and lifestyle factors such as diet and exercise. The body's metabolism can also be influenced by hormonal and environmental factors. For example, the hormones insulin and glucagon regulate the metabolism of glucose, while the thyroid hormone regulates overall metabolic rate.

Overall, metabolism is a complex and dynamic process that is critical for the maintenance of life.