About acetyl-coA in the Krebs Cycle of respiration?

Question

In respiration, Krebs cycle starts with acetyl coenzyme A which is made from pyruvate. However, it is said that the cycle keeps repeat it self with oxaloacetate turning back to citrate and cycle starts again, so why is acetyl coenzyme A constantly supplied to the cycle? According to that logic, shouldn't there be no need for acetyl-coA after the first round?

Answer 1

The cell is in constant need of energy in the form of ATP and NADH and FADH₂. This energy is being obtained from the Acetyl-CoA being continuously supplied to the Krebs Cycle. Without this energy, the cell would not live.