I have run into a question about muscle building at the cellular level and was wondering about peoples opinions. I know a lot of you don't give a crap about this. I totally understand. In that case, just walk away.
Given: A myofibril is composed of many sarcomeres lying end to end in a series from one end of the cell to the other, then
Question: When a muscle cell builds a myofibril, a) does it just lay down all the sarcomeres necessary to span the entire cell all at once/in a very short period of time or b) are there "unfinished" myofibrils sitting around in muscle cells that do not span the entire length of the cell?