Physical Evidence That Supports the Sliding Filament Theory of Muscle

Multiple Choice

Physical evidence that supports the sliding filament theory of muscle contraction includes

A) constant distance between Z lines during contraction.
B) decreased width of the H band during contraction.
C) increased width of the I band during contraction.
D) decreased width of the A band during contraction.
E) the I band + H band distance is constant during contraction.