CHOOSE ONE ANSWER 1. When a muscle has been contracting for an extended period o

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CHOOSE ONE ANSWER 1. When a muscle has been contracting for an extended period of time (more than a few minutes), the primary source of ATP is.. A. Glycolysis B. None of the choices are correct C. Breakdown of myosin D. Oxidative phosphorylation E. Transfer of energy and phosphate from creatine phosphate to ADP FOR EACH OF THE FOLLOWING, MORE THAN ONE ANSWER CAN BE CORRECT. 2. One cause of fatigue in fast-glycolytic muscle fibers is A. Accumulation of potassium ion in the lumen of T tubules B. Depletion of oxygen in the fiber C. Depletion of ATP in the fiber D. Depletion of creatine phosphate in the fiber 3. John is a sprinter who specializes in quick and powerful bursts of speed followed by periods of rest. Jim is a marathon runner who specializes in long, steady runs. Compared to John, Jim is likely to have A. More myoglobin in his type II b muscle fibers B. More glycogen stored in his type II b muscle fibers C. More mitochondria in his type I and II a muscle fibers 4. Which of the following statements about different kinds of skeletal-muscle fibers is true? A. Fast-glycolytic fibers can generate greater tension than can slow-oxidative fibers B. Fast-glycolytic fibers have a greater abundance of myoglobin than do slow-oxidative fibers C. Slow-oxidative fibers have a greater abundance of glycogen than do fast-glycolytic fibers 5. Which of the following statements regarding myosin in skeletal muscle is/are true? A. Myosin heads contain two functional sites, one for actin and one for tropomyosin B. The rate of ATP hydrolysis by myosin is the same in all types of skeletal muscle C. Myosin is an ATPase 6. Fast-glycolytic muscle fibers differ from slow-oxidative fibers in that A. The former rely on creatine phosphate as an ATP source for the first few seconds of contraction whereas the latter do not B. The former generate less lactic acid than do the latter C. The former can generate greater maximal tension than the latter D. The former have a smaller diameter than the latter TRUE/FLASE 7. Sustained contraction and tension in a skeletal muscle is called tetanus. 8. The larger the diameter of a skeletal-muscle fiber, the greater the tension it can generate. 9. In general, activating a slow-oxidative motor unit in a muscle will generate more tension than activating a fast-glycolytic motor unit.

Explanation / Answer

A. Glycolysis

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