Taller 13. Movimiento y Sostén (cap 48) 1. The contractile ability of muscle derives from interactions between actin and myosin filaments. The three types of muscle are skeletal, cardiac, and smooth. Contraction in all three depends on control of Ca 2+ in...
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Taller 13. Movimiento y Sostén (cap 48) 1. The contractile ability of muscle derives from interactions between actin and myosin filaments. The three types of muscle are skeletal, cardiac, and smooth. Contraction in all three depends on control of Ca 2+ in the sarcoplasm. Tropomyosin and troponin are controlling elements in skeletal and cardiac muscle. Calmodulin is the controlling element in smooth muscle. a. Explain how the cellular and subcellular structure of skeletal muscle relate to the sliding filament theory of muscle contraction. See pp. 1007–1009 and Figures 48.1, 48.2, and 48.3 b. What is the role of Ca2+ in the contractile mechanism of skeletal, cardiac, and smooth muscle? See pp. 1010–1011 and Figures 48.5 and 48.6 c. What role does ATP play in the actin and myosin interactions that produce contraction? See Figure 48.6 2. Depending on the function a muscle serves, it may need to generate maximum force rapidly, sustain activity for a long period, or contract and relax at a v
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