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9. _ These invaginations allow depolarization of the muscle membrane to quickly penetrate from the sarcolemma to the myofibril
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9. _

These invaginations allow depolarization of the muscle membrane to quickly penetrate from the
sarcolemma to the myofibril

User TimNguyenBSM
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Calcium because yea..... ....
User Vinay Kumar
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Answer:

Calcium

Step-by-step explanation:

User Abdul Gafoor
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