The energy of the
muscular contraction is providing by the conversion of adenosine triphosphate
(ATP) into adenosine diphosphate (ADP). ADP is then immediately turned back
into ATP by energy provided by the breakdown of glycogen. In the presences of
adequate supplies of oxygen, this breakdown is aerobic and produce carbon
dioxide and water. If there is not enough oxygen the glycogen is only broken
down to lactic acid (anaerobic glycogen) and the content of lactic acid in the
blood increases. This is normal occurrence in vigorous athletes, but occurs to
readily in patients whose heart or circulation does not supply the working
muscles with enough blood.
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