This is a muscle fiber model/ sarcomere. Question 1 (5 points) / sored 3 Iband 2M Mine 1 actin cable 1. A this region shortens during 5 sarcomere shortening and 2. B is spanned by myosin 3. C 7 z-disk 4. D hydrolyzes ATP 5. E the protein dystrophin is connected to this structure 6. F this actin containing region 7. C spans between 2 sarcomeres A-band 6 myosin.