Question

6 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 cellular respiration process slows down to allow the muscles to store the needed energy. b the mitochondria in the muscles generate energy through cellular respiration. c cells can perform cellular respiration without input from other organs or organ systems. d heat provided by the run gives the body energy to make atp. e the lungs support cellular respiration by providing oxygen needed to produce atp from the carbohydrates.

Explanation:

Carb-loading increases glycogen stores (from carbs), which are broken down for cellular respiration. Mitochondria in muscle cells use these carbs (via respiration) to make ATP (energy for endurance). Lungs provide O₂, critical for aerobic respiration to produce ATP from carbs. Other options are incorrect: A is false (respiration speeds up when using stored carbs), C is false (cells need nutrients/O₂ from other systems), D is false (heat is a byproduct, not energy source for ATP).

Answer:

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