During intense exercise, your muscles obtain fuel by burning glycogen and also proteins and their amino acids. The carbon skeleton products of these reactions are salvaged and recycled or, if potentially toxic, converted to an excretable form. This is accomplished by two cycles, the glucose-alanine cycle and the Cori (or lactic acid) cycle. The simplified schematic below illustrates the interweaving of these two pathways.
After reviewing the two pathways and noting the unnamed "body/tissue locations" marked by boxes A, B, and C, and the unnamed biochemical reactions or pathways numbered 1-4, identify ALL of the following statements which are TRUE.
Select ALL that apply.