Question

Explain how your skeletal muscles will use the three possible ATP sources: the phosphagen system, lactic acid fermentation, and aerobic cellular respiration (not all will be used in each situation).

1- You get up from a nap and walk to the kitchen to make a sandwich. It is a fancy sandwich, so it takes you 10 minutes to make it.

2- You are sitting calmly on the couch watching your favorite show.

3- You are sitting calmly on a park bench when a grizzly bear starts coming toward you. You must run away at FULL SPEED (beyond your fitness level) for 15 minutes before you lose the bear.

Answer 1

1. After getting up from a nap and walk to the kitchen to make a sandwich - cellular respiration and lactic acid fetemntation is used.

Cellular respiration is aerobic respiration in which ATP is synthesized in the presence of oxygen and it act as a ATP source in resting conditions and some light exercise.

Anaerobic respiration comes into picture during continous work.

Phosphate system is used as a energy source in sprinting, throwing and rapid energy requiring tasks.

2. During this resting condition : Cellular respiration is used.

3. Here phosphate system and lactic acid fermentation will be used as a source of energy.