How would you explain muscle cell

1. How would you explain muscle cell contraction were there no T tubules?
2. How would you design the skeletal muscle differently if there were no epimysium, perimysium, or endomysium?
3. If skeletal muscle fibers could store large quantities of adenosinetriphosphate (ATP), how would you explain the change, if any, in our ability to run at top speed for a distance (or to perform any anaerobic exercise)?