What organelle in muscle cells was affected most during exercise? explain how the function of this organelle relates to the breath rate data ( m my brain is not functioning ㅠㅠ)

The most affected organelles are the mitochondria. Since the movement is energy mitochondria provide the energy needed for the muscle tissue contraction using up ATP in the process. And since oxygen is needed for the production of ATP when consumption of ATP is ramped up it also needs more oxygen to replenish the ATP consumed in exercise. Hence the accelerated breath.

The skeletal muscle is the most affected organelle during exercise