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- Why do you think a person is able to perform anaerobic exercise (such as lifting and holding a heavy weight) only briefly but can sustain aerobic exercise (such as walking or swimming) for long periods? (Hint: Muscles have limited energy stores.)Classify characteristics of skeletal muscle energy metabolism by dragging each statement to its correct metabolic pathway for ATP synthesis. Allows time for the other two pathways to increase their ATP production Reaction is catalyzed by creatine kinase Blood glucose and fatty acids become fuel for this pathway after 10 minutes of exercise Lactic acid is a waste product produced by this pathway Rapid means of forming ATP during the first few seconds of muscle contraction Very rapid, requiring only a single enzymatic reaction Produces ATP used during moderate, prolonged levels of muscular activity This pathway requires oxygen Produces a significant fraction of ATP during high-intensity Produces ATP from glucose quickly in the absence of охудen Uses glycogen broken down into glucose during the first 5-10 minutes of moderate exercise Produces only small quantities of ATP for each metabolized glucose molecule exercise Oxidative Phosphorylation Creatine Phosphate Glycolysis ResetWhich of the following is NOT true of fast oxidative skeletal muscle fibers? O All of the above describe fast oxidative muscle fibers There muscle fibers are surrounded by a high number of capillaries There muscle fibers contain many mitochondria There fibers can be converted to slow oxidative fibers during periods of no training There is a high myoglobin content in these types of fibers
- Describe the different systems within skeletal muscle that provide skeletal muscle with ATP In your answer include, substrates used, products produced, duration that the system lasts, and their associated contributions to muscle fibre typeMuscle contraction involves a protein conformational change called the power stroke. Where ultimately does the energy come from that allows a series of conformational changes involved in the power stroke? O Ca2+ O ATP hydrolysis O Actin polymerization O GTP hydrolysisSkeletal muscle is described as striated. What are the lighter, thinner stripes noted under the microscope? Group of answer choices troponin actin myosin dystrophin Rather than innervating individual muscle fibers, motor neurons often innervate two or more muscle fibers. The motor neuron and the muscle fibers it innervates are together called a: Group of answer choices motor unit myofibril muscle fascicle motor fascia Fast glycolytic muscle fibers allow for relatively quick ATP energy production by splitting glucose (but eventually leads to fatigue), a process described as: Group of answer choices fermentation aerobic pathway anaerobic pathway ATP reserve use
- In order to study and understand muscle diseases, one needs to have a good understanding of normal muscle function. Briefly outline the process of cross-bridge cycling in muscle contraction. Be sure to highlight the role of Ca2+ and ATP/ADP in the process.For the skeletal muscle, hydrolyzation of ATP: Group of answer choices At the myosin head gives rise to the generation of power stroke. At the actin G-molecule gives rise to the generation of power stroke. At the myosin head give rise to the rotation of myosin head to the "cocked back" position. At the actin G-molecule give rise to the rotation of myosin head to the "cocked back" position.While Colette is researching weight lifting techniques, she finds contradictory information about the "best" way to build muscle. Which of the following statements is true of skeletal muscle? O The speed of muscle contraction is not dependent on how fast the myosin heads split ATP. O Anaerobic exercise depends on oxygen. O Slow oxidative fibers have a low myoglobin content and are used for explosive muscle movements, like sprinting. O Fast glycolytic fibers are used for actions like weightlifting, fatigue very quickly, and have very little myoglobin content.
- When ATP levels return to normal after intense muscle activity, is creatine predominantly phosphorylated or unphosphorylated? Draw your answer, phosphorylated or unphosphoryalted Please help. I've tried to draw it both ways but the system keeps telling me it's wrong and I don't know what I'm doing wrongThe filaments of skeletal muscle are moved by free energy derived from the hydrolysis of ATP. During sustained muscle contraction ATP levels remain fairly constant, while levels of creatine phosphate fall. Explain why this is so. Under what circumstances is an oxygen debt incurred during muscle contraction?