Answer to Question #48133 in Biochemistry for diane

Question

I am teaching AP bio for the first time. I have a question about the oxidation of pyruvate. I see that pyruvate has a negative charge on the carboxyl end. During the oxidation of pyruvate CO2 is said to be oxidized and NAD is reduced to NADH. Where does the H come from to attach to the NAD? I feel like I am missing something obvious. thanks