statements. 1. Muscle twitch is caused by ____ 2. The 3 phases of muscle twitch are ____ 3. Fast twitch muscle fibers differ from slow twitch fibers because ____ 4. The muscle can't be stimulated to contract during ____ period. 5. Myogram shows ____

12. The _________________________ is the main functioning unit of muscle fibers and where the “action” takes place.  It is bordered at each end by _____________. A. sarcomere; Z lines B. actin; H bands C. myofilament; M lines D. tropomyosin; I bands

Choose the incorrect statement about skeletal muscle.   Question 3 options:   Skeletal muscle is made from thousands of muscle fibres running along the length of the muscle.   Each myofibril contains repeating patterns of sarcoplasmsic reticulum, giving muscle tissue its typical striated pattern.   Each individual fibre in a muscle is a single cell containing multiple nuclei.   Within in each fibre, there are longitudinal myofibrils made up from thin and thick filaments.