Final answer:
In metabolism, the process called anabolism transforms nutrients into complex substances to build body tissues, using energy to synthesize larger molecules from smaller ones. Anabolism is a part of metabolism that works alongside catabolism, the latter breaking down complex substances into simpler ones and releasing energy.
Step-by-step explanation:
In the phase of metabolism called anabolism, substances such as nutrients are changed into more complex substances and used to build body tissues. This process involves the assembly of complex chemicals the body needs by combining smaller molecules, often derived from food intake. During anabolism, the body utilizes energy to synthesize these larger, complex molecules from simpler ones.
Anabolism, often referred to as biosynthesis, is a set of metabolic reactions where living organisms construct essential molecules from smaller units. This is contrasted with catabolism, where larger, more complex substances are broken down into smaller, simpler molecules, a process which releases energy. Together, anabolism and catabolism constitute the two categories of metabolism, working in tandem to maintain bodily functions.