| http://www.w3.org/ns/prov#value | - They convert energy from food into chemical energy called adenosine triphosphate, or ATP.Under normal conditions, mitochondria are able to make ATP extremely rapidly when the heart is stressed, such as during exercise or in 'fight-or-flight' mode.However, if the cells are made to beat suddenly from rest, a situation that happens when the heart is re-started after cardiac surgery or a heart attack,
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