Actin and Myosin

ID #1580

I think you said that a muscle fiber forms by the fusion of several other cells. If this is correct, are muscle fibers constantly changing shape to incorporate new muscle fibers and to then divide? Also, does the fusion of several cells to form a muscle fiber involve actin-myosin interactions?

The interesting thing about muscle development is that the muscle fibers don't divide, they just get added to as necessary. There are special muscle-specific stem cells called myoblasts which can fuse with an existing muscle fiber and differentiate. I'm afraid I don't know the mechanism by which this happens.

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