Muscle Fiber Types 2 If a type I fiber and a type II fiber of the same size are stimulated side by side, a. type II will generate more force than type I b. type I will contract more quickly than type II c. they will generate the same amount of force d. they will contract at the same speed OOOOO

During muscle contraction, binding sites for myosin are uncovered by the movement of A. Tropomysin B. Actin myofilaments C. ADP D. Troponin

Muscle Fiber Types 2 If a type I fiber and a type Il fiber of the same size are stimulated side by side, a. type Il will generate more force than type I b. type I will contract more quickly than type II c. they will generate the same amount of force d. they will contract at the same speed O0000

10. Which of the following skeletal muscle fiber structure is not part of the “triad”? a. sarcomere b. t-tubule c. terminal cisternae of the SR d. b and c e. a, b, and c

The muscle fibers with the fastest contractions are O slow oxidative O fast oxidative O fast glycolytic O fascicles

Muscle Fiber Contraction 2 Why is it necessary to have an action potential (electrical signal) in the muscle for contraction? a. Actin and myosin must be electrically charged to create a cross-bridge. b. The SR will only release Ca2+ if it has been electrically stimulated. c. Sarcomeres require a negative electrical charge to start sliding. d. ATP cannot be split into ADP and Pi without an action potential.

HON 48 The Sarcomere 3 Which protein shields the myosin-binding site, preventing contraction from happening at rest? a. actin b. myosin c. troponin d. tropomyosin

Flexing your forearm with no load (nothing in your hand) involves primarily. muscle fibers. Type 2X (FG) Type 2A (FOG) O Type 1 (SO) All of these fiber type are involved

Indicate whether the sentences 4, 5 and 11 is True or False

1. When cross-bridge binding occurs, actin and myosin shorten and the muscle contracts. True False