Final answer:
The primary objective of cellular respiration is to release energy by converting glucose into ATP, with carbon dioxide and water being byproduct that get exhaled or excreted.
Step-by-step explanation:
The main reason that cells carry out cellular respiration is to release energy. This process involves biochemical pathways that convert glucose and oxygen into carbon dioxide and water, and crucially, transfer energy to ATP (adenosine triphosphate). ATP is the energy currency of the cell, allowing for various cellular processes. During cellular respiration, energy stored in glucose is extracted in a controlled manner to prevent heat and light discharge, which would be destructive to cellular structures.
Through the digestive system, cells receive glucose, which is necessary for cellular respiration. Simultaneously, the respiratory system provides the oxygen that is required. The cardiovascular system plays a role by transporting these substances between the digestive, respiratory, and cellular sites. After cellular respiration, the byproducts—carbon dioxide and water—are eliminated from the body with the help of the respiratory and urinary systems.Therefore, the correct answer to the question is 'B. Release energy'. This is crucial for maintaining cellular functions and the overall metabolic activity within organisms.