What is catabolism primarily responsible for in metabolism?

Catabolism is primarily responsible for the breakdown of molecules for energy. This process involves the degradation of complex molecules, such as carbohydrates, fats, and proteins, into simpler ones. During catabolic reactions, chemical bonds are broken, which releases energy stored in those bonds. This energy is then used to fuel various cellular processes and activities.

In contrast, anabolic processes are focused on the synthesis of complex molecules from simpler ones, such as building cellular structures or storing energy. While neurotransmitter synthesis and fat storage are essential metabolic functions, they involve an anabolic approach rather than catabolic, which emphasizes breaking down substances to release energy rather than creating or storing them. Hence, the function of catabolism aligns specifically with the breakdown of molecules for energy.