4. Heterogeneity of muscle speed in different muscle fibers depends in part on the A. Length of its thick filaments B. Length of its thin filaments C. Myosin isoform expressed by the muscle fiber D. Actin isoform expressed by the muscle E. Speed of nerve action potential conduction
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Step 1: The speed of muscle contraction is determined by the rate of ATP hydrolysis by myosin. Show more…
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23. Which of the following has the most endurance? (a) a Type I fiber (b) a Type IIa fiber (c) a Type IIb fiber (d) fast twitch fibers (e) glycolytic fibers 24. Which of the following will NOT result in an increase in muscle tension (strength of contraction)? (mark all that apply) (a) Increasing the number of neurons firing (b) Increasing the number of muscle fibers contracting (c) Increasing the number Type I vs Type IIb fibers used (more type I used, less Type IIb used) (d) Increasing intracellular Ca2+ (e) Increasing the stretch of the sarcomere to maximal length 25. Which of the following is the primary reason for the fine control of finger movement? (a) The high endurance of the type I fibers (b) The increased number of small motor units (c) The GPCR controlled muscle fibers (d) The higher strength of the type IIb fibers (e) the increased number of large motor units
Adi S.
Select the total number of true statements from the following. 1. Each myosin (thick) filament is also a polymerized protein. 2. Many monomeric proteins called meromyosins constitute one thick filament. 3. Each meromyosin has two important parts, a globular head with a short arm and a tail, the former being called the heavy meromyosin (HMM) and the latter is called the light meromyosin (LMM). 4. The HMM component, i.e., the head and short arm projects outwards at regular distance and angle from each other from the surface of a polymerized myosin filament and is known as cross arm. 5. The globular head is an active ATPase enzyme and has binding sites for ATP and active sites for actin. (a) 1 (b) 2 (c) 4 (d) 5
Which of the following statements about skeletal muscle anatomy is/are true? (a) An individual skeletal muscle fiber contains many sarcomeres. (b) The A-band includes the regions of the sarcomere where actin and myosin fibers overlap. (c) Tropomyosin and troponin proteins are primarily found in the H-zone. (d) Both (a) and (b) are correct and (c) is incorrect (e) Statements (a), (b) and (c) are all correct
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