Which of the following is NOT TRUE according to the sliding filament theory? Choose one answer.?
a. When a muscle fiber is not contracting, the thin fibers are not connected to the thick fibers.
b. Sliding occurs when the myosin cross bridges change angle.
c. When actin pushes the Z lines further apart, the muscle expands.
d. The muscle relaxes when calcium ions are pumped back into the sarcoplasmic reticulum.
e. The energy for contraction comes from ATP.
c. Actin doesn't push, it only pulls.
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