What are Chemical Processes understood to involve?

Chemical processes are fundamentally understood to involve the transformation of substances through chemical reactions that take place within the body. These processes can encompass a wide range of activities, including metabolism, digestion, and bioenergetics, where substances are broken down or synthesized, resulting in changes to the chemical structure of molecules.

For example, during metabolism, nutrients such as carbohydrates, proteins, and fats are chemically broken down to produce energy; this is essential for physical and biochemical functions within the body. Additionally, chemical processes often involve interactions between various chemicals in the body, such as hormones and neurotransmitters, which play critical roles in regulating biological functions.

While options like physical changes, biological immune responses, or mechanical movements may involve some degree of chemical interaction, they do not directly encompass the broader scope of what chemical processes entail. Therefore, focusing on the specific activities and transformations of chemicals within the body accurately reflects the essence of chemical processes, making option C the correct choice.