Liha töötlemine
to as actomyosin. In electron micrograph control of the concentrations of key ions (like
images of contracted muscle or of postrigor calcium) in the muscle cell. Cleavage of Pi
muscle, the actomyosin looks very much like from ATP produces adenosine diphosphate
cross-bridges between the thick and thin fila- (ADP), and cleavage of pyorphosphate (PPi)
ments; indeed, it is often referred to as such. from ATP produces adenosine monophos-
In postmortem muscle, these bonds are irre- phate (AMP). Since the availability of ATP
versible and are also known as rigor bonds, is central to survival of the cell, there is a
as they are the genesis of the stiffness (rigor) highly coordinated effort by the cell to main-
that develops in postmortem muscle. The tain its production in both living tissue and
globular head of myosin also has enzymatic in the very early postmortem period.
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