Explain The Fate of Pyruvic Acid

38) The fate of pyruvic acid formed during muscle activity depends on the A) amount of oxygen available. B) rate of creatine kinase activity. C) relative proportions of actin and myosin present. D) number of nuclei per cell. E) surface area of the sarcolemma. Answer: Most of the lactic acid remaining after exercise is A) converted to glycogen and stored. B) converted to creatine and stored. C) converted to pyruvic acid and used for ATP production. D) used as a building block for new contractile proteins. E) stored as fat. Answer. 40) Slow oxidative fibers are said to be “slow” because they A) break down acetylcholine slowly. B) conduct action potentials slowly. C) manufacture creatine phosphate slowly. D) recover from fatigue slowly. E) hydrolyze ATP slowly. Answer: 41) Muscle cells with relatively few mitochondria that generate most of their ATP via glycolysis and that have low resistance to fatigue are most likely A) slow oxidative skeletal muscle fibers. B) fast oxidative skeletal muscle fibers. Cfast glycolytic skeletal muscle fibers. D) cardiac muscle fibers. E) smooth muscle fibers. Answer: 42) The phenomenon of oxygen debt is believed to be caused by the buildup of A) actin. B) lactic acid. C) creatine phosphate. D) ATP. E) All are correct Answer:
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