Question

anna often finds that she becomes drowsy in the afternoons. the warmer her classroom is, the harder she finds it to stay awake. why does warmth make her more tired?
a. the heat signals the cells in her body to stop cellular respiration in order to conserve oxygen.
b. her body produces less energy in order to keep her from overheating.
c. the environment is so hot that it interferes with the normal chemical reactions of cellular respiration.
d. most of her bodys energy is being used to reduce her temperature through sweating, panting, and similar methods.

Explanation:

• Option A: Cells do not stop cellular respiration due to heat. Cellular respiration is essential for energy production and continues as long as cells are alive.
• Option B: The body does not produce less energy to prevent overheating. It has other mechanisms like sweating.
• Option C: A warm classroom environment (not extremely hot like in some extreme conditions) does not interfere with normal cellular respiration chemical reactions.
• Option D: When the body is in a warm environment, it uses energy for thermoregulation. Sweating, which is a way to cool the body, requires energy. So, if most energy is used for cooling (sweating etc.), less energy is available for other functions like staying awake, making a person feel tired.

Answer:

D. Most of her body’s energy is being used to reduce her temperature through sweating, panting, and similar methods.