Discussion
Which acid is formed during Rigor Mortis ?
Answer: B
The acid formed during rigor mortis is lactic acid.
After an animal is slaughtered, the oxygen supply to the muscle stops. Muscle glycogen is then broken down anaerobically, by glycolysis, to lactic acid, and the pH of the meat falls from about 7 to about 5.5. As ATP runs out, actin and myosin lock together and the muscle stiffens, which is rigor mortis.
Citric acid belongs to the TCA cycle, which needs oxygen. Oxalic acid occurs in plants such as spinach, and gluconic acid is made by oxidising glucose; neither is formed in post-mortem muscle.
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