What false about Henneman's size principle? Select one: a. The relative change in force remains relatively constant b. Minimizes the amount of fatigue C. Motor units are recruited from smallest to largest d. Low force recruited first e. Fast twitch recruited first
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- Which of the following will produce the LARGEST force of twitch contraction? Explain your answer.a. Stimulation of all alpha motor neurons in a muscleb. Stimulation of all alpha motor neurons plus all gamma motor neurons in a musclec. Both stimulations will cause a similar force of twitch contractionTo demonstrate muscle fatigue, a student held an 8 lb dumbbell in her hand and abducted her arm parallel to the floor. After 45 seconds, she has having difficulty holding that position so she rotated her hand 90 degrees. This allowed her to hold the dumbbell in position for an additional 20 seconds. Which of the following is the best explanation for this? A. Different motor units were contracting while others were relaxing. B. Muscles began to contract isotonically rather than isometrically. C. The load was reduced. D. The resistance to contraction was reduced. E. The change in position provided a greater range of motion at the shoulder.Any stimulus above a maximal stimulus will elicit 1. A steadily increasing force 2. No force because the muscle is fatigued 3. A steadily decreasing force 4. The same maximal response
- Which of the following would be recruited in a muscle stimulation when contractile strength increases? A) Many small motor units with the ability to stimulate other motor units B) Motor units with the longest muscle fibers C) Motor units with larger, less excitable neurons D) Large motor units with small, highly excitable enduranceDefine the all-or-none principle. The same student remarked that at 180 mV stimulus, it is expected that 100 g mass is lifted by the muscle fibre. Do you agree or disagree? Why or why not?The fast fatigable motor units are used predominantly for which of the following activities? a. The action potentials fired by alpha motor neurons become slower. b. Slow twitch muscle fibers show increased myosin ATPase. c. Fast fatigable motor units are recruited before slow twitch motor units. d. None of the answers. e.All of the answers.
- Which of the following statements accurately describes the pattern of recruitment in a muscle when performing a maximal force contraction? A. A few small and medium motor units will be recruited; if that's not enough, then all of them will be. B. Small motor units are recruited first, then medium, and then the largest to reach maximum force.The fast fatigable motor units are used predominantly for which of the following activities? a.Sleeping. b.Jumping. c.Walking. d.Sitting. e. Standing.The basic lesson from the concentric force-velocity relationship is: Group of answer choices muscles exert high forces muscle force is highest in the middle of the muscle’s shortening phase muscle force is highest at the start of the muscle’s shortening phase aul DeVita thinks he is faster than Usain Bolt (not really true and do not select this answer)
- Fatigue is not well understood. Some factors that have been proposed to explain the fall in force duringfatigue include: changes in the 'sense of effort', loss of 'central drive', failure of neuromuscular propagation, reduction in calcium release in excitation- contraction coupling, metabolic changes in the muscle, and reduction in muscle blood flow owing to compression of blood vessels. 1. Do your experiments help to decide which factors are important?The discharge from Golgi tendon organs initiated by excessive stretch ofa skeletal muscle produces :-a- inhibition of α -motor neurons of antagonistic musclesb- inhibition of γ-motor neurons of antagonistic musclesc- inhibition of α -motor neurons of the same muscled- stimulation of γ-motor neurons of the same muscleContinually training with a specific loading condition that does not vary over time will most likely result in _________________ and little additional improvement.velocity specificty accommodationmuscle action specificityreversibility
