Final answer:
Homeostasis refers to the balance of all functions in the organism (option c), achieved through a dynamic equilibrium, and is regulated by a combination of the nervous system, hormones, and other body systems.
Step-by-step explanation:
The correct answer about homeostasis is that it means balance of all functions in the organism (option c). Homeostasis is the process by which the body maintains a state of internal balance or equilibrium. It is a dynamic equilibrium because it is constantly adjusting to the changes that the body's systems encounter. This balance is crucial because it keeps body functions within specific ranges. The human body achieves homeostasis through a combination of various mechanisms including the nervous system, hormones, as well as feedback systems that involve receptors, control centers, and effectors.
Homeostasis is not merely the sum of all anabolic and catabolic reactions (option a), nor is it the rate of burning calories (option b). Although the nervous system (option d) and hormones (option e) play significant roles in maintaining homeostasis, they are not the only systems involved. There are intricate interactions between various systems in the body that collectively maintain homeostasis.