Well hello there, kind sir. What a mighty fine bit of cellular respiration you're doing over there!
Cellular respiration? How does that relate to what I'm doing?
Playing the flute relates to cellular respiration because oxygen is needed to make sound. Your fingers need to move very fast when a lot of notes need to be played very quickly, and like continuously pinching a clothespin, eventually lactic acid will accumulate and it would be painful to continue to play.
When someone plays the flute for a long time, their heart rate increases and blood is pumped to the cells, and in the blood there is oxygen. Aerobic respiration starts at first, and glucose is being converted into ATP with oxygen. After a while, when oxygen isn’t as abundant, aerobic respiration occurs, which creates energy without the use of oxygen.
Lactic acid fermentation begins when the muscles no longer have any oxygen to create energy with, so lactic acid is created as an alternate form of creating energy. Lactic acid fermentation, an anaerobic process, creates energy from glucose without the use of oxygen.