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interact. ribose sugar) and three phosphate groups (tri-
For contraction to occur, the thick and thin phosphate). Cleavage of the bonds between
filaments interact via the head region of the phosphates (Pi) and the rest of the mole-
myosin. The complex formed by the interac- cule provides energy for many cellular func-
tion of myosin and actin is often referred tions, including muscle contraction and the
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-
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