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Post labs 10 ch. 9. questions with answers

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1. 2. 3. 4. 5. 6. Post labs 10 ch. 9 The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________. A. actin and myosin interact by the sliding filament mechanism B. the site of calcium regulation differs C. ATP energizes the sliding process D. the trigger for contraction is a rise in intracellular calcium the site of calcium regulation differs Which of the following statements best illustrates the fact that skeletal muscle is voluntary muscle? A. Skeletal muscle fibers are innervated by somatic motor neurons. B. Skeletal muscle is wrapped in several layers of connective tissue. The deepest layer being the endomysium. C. The shivering reflex aids in maintaining body temperature. D. Skeletal muscle appears striated due to the structure of the sarcomeres. Skeletal muscle fibers are innervated by somatic motor neurons. The 100 meter dash is a quick and short run requiring explosive speed. On completion of the dash the runners will continue to breathe hard for several seconds to minutes even though they are no longer running. Which of the following is the best explanation for why this is so? A. The runners' use of stored oxygen, glucose and creatine phosphate is being replenished and this requires a prolonged increase of oxygen intake. B. Slow oxidative fibers are recruited last and have only started to work at completion of the run. C. Since the exercise was mostly aerobic exercise, the runners' bodies have not yet realized the run is over. D. The runners' fast oxidative muscles are so slow to utilize oxygen it only begins aerobic respiration by the time the run has finished. The runners' use of stored oxygen, glucose and creatine phosphate is being replenished and this requires a prolonged increase of oxygen intake. What is the most distinguishing characteristic of muscle tissue? 1. the ability to respond to nervous stimulation 2. it is composed of multiple cells working together 3. its cells' in ability to reproduce by mitosis 4. the ability to transform chemical energy into mechanical energy to move the body the ability to transform chemical energy into mechanical energy to move the body Although all the anatomical parts of muscle work together to give it it's characteristics, which of the following proteins listed below would be most associated with the characteristics of extensibility? 1. thick (myosin) filaments 2. elastic (titin) filaments 3. acetylcholine receptors in the motor end plate 4. potassium (K+) leak channels elastic (titin) filaments What is the primary function of wave summation?

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