The electron micrograph shows sarcomeres in myofibrils of striated muscle during muscle contraction. The lines P-Q and R-S show two regions of one sarcomere.

The electron micrograph shows sarcomeres in myofibrils of striated muscle during muscle contraction. The lines P-Q and R-S show two regions of one sarcomere.

How would regions P-Q and R-S change when the muscle relaxes?

P-Q	R-S
wider	narrower
narrower	wider
wider	no change
no change	wider