Question

cells in the body use oxygen for cellular respiration. select the two sentences that correctly describe cellular respiration.

atp is produced.

atp is consumed.

carbon dioxide is absorbed.

carbon dioxide is released.

Explanation:

1. For "ATP is produced": Cellular respiration is the process by which cells break down glucose (usually) in the presence of oxygen to release energy. This energy is used to synthesize ATP (adenosine triphosphate), which is the energy currency of the cell. So ATP is produced during cellular respiration.
2. For "ATP is consumed": This is incorrect because cellular respiration's main goal is to produce ATP, not consume it. Processes like active transport or muscle contraction consume ATP, but cellular respiration itself generates it.
3. For "Carbon dioxide is absorbed": In cellular respiration, glucose and oxygen are reactants, and carbon dioxide is a product. So cells do not absorb carbon dioxide during respiration; instead, they release it. Photosynthesis (in plants) absorbs carbon dioxide, not cellular respiration.
4. For "Carbon dioxide is released": During cellular respiration, the chemical reaction is \( C_6H_{12}O_6 + 6O_2

ightarrow 6CO_2 + 6H_2O + \text{Energy (ATP)} \). As seen from the equation, carbon dioxide is a product, so it is released by the cells into the bloodstream (to be transported to the lungs for exhalation).

Answer:

• ATP is produced.
• Carbon dioxide is released.