Combustion reactions in the body are primarily involved in respiration and metabolism. These processes are essential for converting the energy stored in food into a form that the body can use.
Respiration is the process by which cells obtain energy from glucose. During cellular respiration, glucose reacts with oxygen to produce carbon dioxide, water, and energy in the form of ATP (adenosine triphosphate). This energy is then used to power various cellular activities.
Metabolism encompasses all the chemical reactions that occur within the body to maintain life. It includes both the breakdown of molecules to obtain energy (catabolism) and the synthesis of compounds needed by the cells (anabolism). Combustion reactions are a key part of catabolism, where nutrients are broken down to release energy.
While digestion and cell division are crucial biological processes, they are not directly involved in combustion reactions. Digestion breaks down food into smaller molecules that can be absorbed and used by the body, and cell division is the process by which cells replicate. However, the energy required for these processes is derived from the combustion reactions that occur during respiration and metabolism.
Therefore, the correct answer is d) respiration and c) metabolism.