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20 Nov 2019
2) 2) The function of T-tubles (transverse tubules) is to A) rapidly conduct action potentials to the interior of a muscle fiber. B) store Ca2+ ions inside the muscle fiber. C) conduct ATP molecules out of the mitochondria throughout the sarcoplasm. D) ensure a supply of glycogen throughout the muscle sarcoplasm. 3) 3) What is the primary role of titin protein in the sarcomere? A) Alignment of actin thin filaments B) Regulation of crossbridge formation C) Serving an an elastic element D) An activating co-factor for myosin kinase (ML.CK) E) None of the above 4) 4) If you were to look at a cross-section of a sarcomere in the I-Band (but not the Z-disk), which filaments would you see? A) Myosin thick filaments and cross-linking accessory proteins B) Only myosin thick filaments C) Both actin thin filaments and myosin thick filaments D) Only actin thin filaments E) Actin thin filaments and cross-linking accessory proteins
2) 2) The function of T-tubles (transverse tubules) is to A) rapidly conduct action potentials to the interior of a muscle fiber. B) store Ca2+ ions inside the muscle fiber. C) conduct ATP molecules out of the mitochondria throughout the sarcoplasm. D) ensure a supply of glycogen throughout the muscle sarcoplasm. 3) 3) What is the primary role of titin protein in the sarcomere? A) Alignment of actin thin filaments B) Regulation of crossbridge formation C) Serving an an elastic element D) An activating co-factor for myosin kinase (ML.CK) E) None of the above 4) 4) If you were to look at a cross-section of a sarcomere in the I-Band (but not the Z-disk), which filaments would you see? A) Myosin thick filaments and cross-linking accessory proteins B) Only myosin thick filaments C) Both actin thin filaments and myosin thick filaments D) Only actin thin filaments E) Actin thin filaments and cross-linking accessory proteins
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