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 $Ca^{2+}$ (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
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We are asked to find which fiber type has the most endurance. Type I fibers are slow-twitch and have high endurance. Type IIa fibers are fast-twitch but have moderate endurance. Type IIb fibers are fast-twitch and have low endurance. Fast-twitch fibers and 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.
3) Slow twitch muscle fibers: a) have characteristically high myoglobin levels, b) are fatigue resistant, c) have few mitochondria, d) a & b, e) a & c. 4) Lo represents: a) optimal sarcomere overlap, b) longest sarcomere length, c) shortest sarcomere length, d) suboptimal sarcomere overlap, e) none of the above. 5) The latch property of smooth muscle refers to the ability of smooth muscle to maintain: a) the rate of ATP production after stimulation, b) maintaining force production while decreasing the rate of energy utilization, c) force in the absence of myosin light chain phosphorylation, d) an entirely relaxed state independent of free Ca++ levels, e) a decreased membrane potential. 6) Which of the following will increase stroke volume: a) reduced activity of cardiac sympathetic nerves, b) increased arterial pressure, c) reduced end diastolic volume, d) low extracellular Ca2+, e) increased ventricular filling pressure.
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