Stretch (mm) 0 2 4 6 8 10 Tension (mN) 1200 900 600 300 0 -300 2.5 s Figure I. Effects of stretch on skeletal muscle tension. Tablel. Total, passive and active tensions of skeletal muscles: Stretch (mm) $T_t$ (mN) $T_p$ (mN) $T_a$ (mN) 0 2 4 6 8 10 13. Fill in Table 1 based on figure I. 14. Calculate the relative tension at 6 mm stretch. 15. Calculate the relative tension at 10 mm stretch. 16. What information does the relative tension measurements convey? 17. Based on Figure I, at what length (in mm) of stretch is the skeletal muscle at its optimal length?
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Calculate the total tension of the skeletal muscles at different stretch lengths: TmNTmN = 600 + 300 = 1,200 Show more…
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In a muscle experiment, the optimal length of an isolated frog gastrocnemius muscle was not known. To resolve the problem, the length of stretch of the muscle was varied five times in increments of 2 mm. With each stretch, a stimulation was applied to the sciatic so as to produce a muscle twitch. Figure I depicts results from the experiment. Table I is an incomplete table that depicts different types of tensions from the muscle experiment. Figure I. Effects of stretch on skeletal muscle tension. Table 1. Total, passive and active tensions of skeletal muscles: Stretch (mm) | Tt (mN) | Tp (mN) | Ta (mN) 0 2 4 6 8 10 13. Fill in Table 1 based on figure I. 14. Calculate the relative tension at 6 mm stretch. 15. Calculate the relative tension at 10 mm stretch. 16. What information does the relative tension measurements convey? 17. Based on Figure I, at what length (in mm) of stretch is the skeletal muscle at its optimal length?
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Which of the figures below shows maximum tension in the skeletal muscle when sarcomeres are at normal resting length? Answer:
Detailed measurements of sarcomere length and tension during isometric contraction in striated muscle provided crucial early support for the sliding-filament model of muscle contraction. Based on your understanding of the sliding-filament model and the structure of a sarcomere, propose a molecular explanation for the relationship of tension to sarcomere length in the portions of Figure $Q 16-1$ marked $I,$ II, III, and IV. (In this muscle, the length of the myosin filament is $1.6 \mu \mathrm{m}$, and the lengths of the actin thin filaments that project from the Z discs are 1.0 $\mu \mathrm{m} .$
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