When does cellular respiration take place?

Question

Am I right to assume that cellular respiration is happening constantly and that for everything to function, cellular respiration must take place? Could someone please help me out with understanding this?

Answer 1

Keep in mind that cellular respiration is an AEROBIC process, which means that oxygen must be present.  Otherwise, the process of fermentation will begin.  So, yes, it is a constant process as long as oxygen is present.

  

Answer 2

Yes you are correct.  It's like us, we have to be constantly breathing to live.  Well, cellular respiration also has to be constant to keep on making energy (ATP).