For each of the following activities. 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).
A hint: when you drastically increase your activity level, your heart rate and respiration rate will take some time to speed up to meet the increased O2 needs. Unless your activity level is more strenuous than your heart rate and respiration rate can accommodate, they will be able to “catch up” and provide adequate O2 delivery after several minutes.
The three ATP sources are used based on ATP requirement and
Basically - at rest we use aerobic
Sudden movment - short period of time, few seconds - used phosphagen system based on creatine
Rapid response - lactic acid
1. Get up from bed and wait for 10 minutes to make the sandwitch. No strenous exercise, but since you are hungry glucose is low in blood. So body uses stored glycogen and carries out aerobic cellular respiration.
2. Sitting calmly on couch - resting phase, aerobic cellular respiration.
3. Running - initially the rapid burst of ATP is provided by Phosphagen system for few seconds. Later Anerobic respiration (lactic acid) takes over to supply rapid ATP to muscle cells.
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