The second main part of cellular respiration is the Krebs cycle, also known as the citric acid cycle.

Here's why:

* Cellular respiration is a series of metabolic reactions that occur in living cells to produce energy. It's divided into four main parts:

1. Glycolysis: Breakdown of glucose into pyruvate.

2. Krebs cycle (Citric Acid Cycle): Further breakdown of pyruvate to generate electron carriers.

3. Electron transport chain: Uses the electron carriers to generate ATP (energy).

4. Oxidative phosphorylation: The process of using the electron transport chain to produce ATP.

Let me know if you'd like more details about any of the steps in cellular respiration!