muscle calcium bindsto initiate a contraction? A. troponin B. calmodulin C. myos
ID: 3513475 • Letter: M
Question
muscle calcium bindsto initiate a contraction? A. troponin B. calmodulin C. myosin D. SERCA pumps 41. The following is a list of the events that occur during a muscle contraction. 1. Myosin cross-bridges bind to the actin. 2. The free myosin head splits ATP 3. Calcium ion is released from the sarcoplasmic reticulum. 4. The myosin head pivots toward the center of the sarcomere. 5. Calcium ion binds to troponin. 6. The myosin head binds an ATP molecule and detaches from the actin. The correct sequence of these events is A) 1,3, 5, 4, 6,2 B)5, 1,4,6,2,3. C) 3, 5, 1, 2, 4,6. D) 3, 5, 1, 4,6,2 E) 1, 4,6, 2,3,5. 42. Which of the following protein serves as an anchor to secure actin A. actin B. myosin C. tropomyosin D. titin to the Z line? 43. Skeletal muscle fibers differ from "typical cells" in that muscle fibers A. lack a plasma membrane. B. have many nuclei. C. are very small D. lack mitochondria. 44. The principle that states the force of contraction is dependent on the degree of stretch or contraction prior to stimulation is the A. sliding filament theory. B. muscle tone. C. length-tension relationship. D. summation principle. 45. Fast muscle fibers are different than slow muscle fibers due to: A. decreased mitochondrial number. B. increased contractile power C. lower myoglobin content. D. All of the above 46. Put the following structures in order from superficial to deep: l. muscle fiber 2. perimysium 3. myofibril 4. fascicle 5. endomysiumExplanation / Answer
40) B. Calmodulin
41) C. 3,5,1,2,4,6.
42) D. Titin
43) B. Have many nuclei
44) C. Length Tension relationship
45) B. Increased contractile power
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