Final answer:
Oxygen (O2) and glucose (C6H12O6) are the reactants used in cellular respiration, making option B the correct answer. This process transforms these inputs into energy (ATP), carbon dioxide (CO2), and water (H2O).
Step-by-step explanation:
The substances used up as the reactants in cellular respiration are oxygen (O2) and glucose (C6H12O6). Therefore, the correct answer is B. O2 and C6H12O6. Cellular respiration is the process by which cells convert glucose and oxygen into energy in the form of adenosine triphosphate (ATP), producing carbon dioxide and water as waste products.
During this process, glucose, which is a simple sugar that organisms gain from the food they consume, is oxidized, meaning it loses electrons, while oxygen is reduced, meaning it gains electrons. The overall chemical equation for cellular respiration is: C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy (in the form of ATP). This process is essential for the production of ATP, which cells use as a direct energy source for various biological functions.
The substances that are used up as the reactants in cellular respiration are O2 and C6H12O6.
During cellular respiration, oxygen enters the body when an organism breathes, and glucose enters the body when an organism eats.
The overall chemical reaction for cellular respiration is:
C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy
Therefore, the correct answer is option B. O2 and C6H12O6.