Indicate if the statements are TRUE or FALSE. ________ 11. Actin is found only in the striated fibers of cardiac and skeletal muscles. ________ 12. Slow twitch msucle fibers are

Indicate if the statements are TRUE or FALSE. ________ 11. Actin is found only in the striated fibers of cardiac and skeletal muscles. ________ 12. Slow twitch msucle fibers are more resistant to fatigue than other muscle fiber types. ________ 13. A sarcomere is the region of a myofibril that lies between two consecutive Z lines. ________ 14. An action potential in a muscle fiber is initiated by stimulation across the neuromuscular junction. ________ 15. A muscle triad consists of sarcoplasmic reticulum, a T tubule, and a terminal cisternum.