Question

carb loading (eating lots of carbohydrates) is a common practice among marathon and triathlon runners. how does carb-loading increase a runner’s endurance on a cellular level? select two choices to support your answer.
a the lungs support cellular respiration by providing oxygen needed to produce atp from the carbohydrates.
b heat provided by the run gives the body energy to make atp.
c the mitochondria in the muscles generate energy through cellular respiration.
d cells can perform cellular respiration without input from other organs or organ systems.
e the cellular respiration process slows down to allow the muscles to store the needed energy.

Explanation:

• Option A: Lungs provide oxygen for cellular respiration (which uses carbohydrates to make ATP), so this supports endurance.
• Option C: Mitochondria in muscles generate ATP via cellular respiration, and carb - loading provides more carbohydrates for this process, increasing energy production for endurance.
• Option B: Heat from running does not help make ATP; ATP is made via cellular respiration.
• Option D: Cells need input from other systems (like respiratory for oxygen) for cellular respiration.
• Option E: Cellular respiration is needed for energy, it doesn't slow down to store energy in this context.

Answer:

A. The lungs support cellular respiration by providing oxygen needed to produce ATP from the carbohydrates.
C. The mitochondria in the muscles generate energy through cellular respiration.