Once proteins undergo deamination (broken down) they cannot be stored, instead they form urea or organic acids, such as pyruvic acid and kreb cycle intermediates, acting as a reparatory substrate allowing the regeneration of ATP. Starvation - Tissue proteins are only used in this stage when all stores of fats and glycogen become exhausted. The person usually becomes too weak and death soon occurs. During marathon running, the body uses up its resources in a specific order - learn this!
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