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OpenStudy (anonymous):

How are muscle cells adapted for the contraction of a cell

OpenStudy (anonymous):

Muscle cells are specialized to contract and relax. They have several unique protein molecules (actin, myosin, etc.) that interlock and are responsive to the local concentration of calcium. When calcium levels go up (calcium is released from the modified SER), the muscle proteins contract. When the calcium levels go down (calcium is pumped back into the modified SER), the muscle proteins relax.

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