Mitochondrion:This is cell organelle hosting mitochondrial matrix; it’s like entire bakery building housing kitchen space and ovens.
Citric Acid Cycle/Krebs Cycle: One of key metabolic processes happening within mitochondrial matrix; it’s akin to recipe followed by baker to prepare dough for pastries.
Pyruvate Dehydrogenase Complex (PDC): An enzyme complex initiating reaction sequence in Krebs cycle; think of PDC as head chef directing preparation process in kitchen.