Malic acid is oxidized and NAD is reduced. A molecule of NADH is produced. Oxaloacetic acid is regenerated to begin the cycle again. Two different carbons leave as carbon dioxide. One ATP molecule is produced by substrate level phosphorylation.
Oxaloacetic acid is regenerated.
For every glucose molecule split during glycolysis, two acetyl fragments are produced. Thus, it takes two turns of the cycle to complete the oxidation of glucose. Most of the ATP output of respiration results later from this oxidative phosphorylation.