What happens during catabolism regarding energy?

• A. Energy is absorbed
• B. Energy is generated
• C. Energy is released
• D. Energy is stored

Answer: (C)

During catabolism, complex molecules are broken down into simpler ones, a process primarily aimed at extracting energy for use by the body. This breakdown of macromolecules, such as carbohydrates, fats, and proteins, leads to the release of energy, which is stored in the form of ATP (adenosine triphosphate) for cellular activities.

This energy release is essential for various physiological functions, including muscle contraction, nerve impulse conduction, and biosynthesis of new molecules. The efficiency of this process allows organisms to harness energy stored in food to perform vital functions required for survival. In contrast, other processes like energy absorption or storage are more aligned with anabolism, where energy is consumed to build complex molecules from simpler ones.