Which term describes the sum of the chemical changes occurring in body tissues?

The correct choice represents the concept of metabolism, which encompasses all the chemical reactions and processes that occur within body tissues. Metabolism is essential for maintaining life, as it involves the conversion of food into energy, the synthesis of necessary compounds for cellular functions, and the breakdown of waste products for elimination.

Metabolism is divided into two main categories: catabolism, which breaks down molecules to release energy, and anabolism, which builds complex molecules required for growth and repair. Together, these processes enable the body to utilize nutrients effectively, sustain cellular processes, and maintain energy levels.

Other terms like homeostasis, absorption, and elimination describe different physiological processes. Homeostasis refers to the body’s ability to maintain stable internal conditions despite external changes. Absorption pertains specifically to the uptake of nutrients from the digestive system into the bloodstream. Elimination involves the removal of waste materials from the body. Although these processes are interconnected with metabolism, they do not encompass the entirety of chemical changes that metabolism describes.