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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- Put the steps for running an EMG to study fatigue in the correct order. At regular intervals, measure the applied force by looking at the blue signal. ts Increase the clench force to maximum eBook eferences Start recording the EMG signal. 3 At every interval, count the number of active motor units, repeat until the applied force drops to 50% of its initial value Mc Graw Hill ype here to searchThe motor unit firing patterns are measured in a human hand muscle using an electromyography (EMG) recording. Which one of the following statements is the best description of the EMG pattern observed as the individual voluntarily attempts to make a low-level force of contraction in the muscle and steadily increases the force of contraction? Low amplitude spikes visible on the EMG trace at low force. Larger amplitude spikes become visible with increasing force of contraction. Low frequency of small amplitude spikes on the EMG trace at low force. Spike frequency and amplitude increase with increasing force. A large single deflection in the trace as the individual contracts the muscle. The deflection gets larger with increasing force. Low frequency of spikes on the EMG trace at low force. The frequency of spikes becomes more frequent with increasing force.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 contraction
- 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 muscleWhich of the following are true regarding length/tension relationships in muscle? O In the sarcomere, the maximal tension occurs at normal resting length O In the whole muscle, maximal passive tension occurs at ½ normal length In the whole muscle, maximal active tension occurs at normal resting length All of the above O Only A and CThe 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)
- The group la afferents from intrafusal fibers are rapidly adapting and show low firing during the dynamic phase and increased firing while the stretch is maintained increased firing during the dynamic phase that is maintained while the stretch is maintained increased firing during the dynamic phase and reduced firing while stretch is maintained constant firing during the dynamic phase and while the stretch is maintainedConcerning the cross-bridge (CB) power stroke, it is true that: O a. All of these O b. In concentric contractions, the CB power stroke pulls the actin filament toward the center of the sarcomere, causing sarcomere shortening O C. In isometric contractions, the CB power stroke pulls the actin filament straight down, preventing shortening or lengthening O d. In eccentric contractions, the CB power stroke pushes the actin filament away from the center of the sarcomere, causing sarcomere lengthening TOSHIBAWhich of the following does NOT describe treppe? It is also referred to as the "staircase" effect. An increase in stimulus intensity is required to see the effect. An incremental increase in force occurs. A period of relaxation can be seen on the muscle twitch tracing.
- Define 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?Muscle motor unit recruitment follows the pattern of the SO (I) fibers being recruited first followed by the FOG (IIa) and then ultimately by the FG (IIb) if and when workloads require this. Muscle fatigue follows the order that the FG fibers fatigue first, followed by the FOG fibers and finally (maybe never) the SO fibers. Explain how it makes sense physiologically that the last fibers to be recruited to contract are the first to fatigue, while the first fibers to be recruited to contract would be the last to fatigue.During muscle isometric tension, the maximum tension occurs when: There is no overlapping between the actin and myosin O a. O b. None of these The myosin and actin overlap without crossing the center O d. The myosin and actin totally overlap Dilatant flow is characterized as a reverse phenomenon of: a. Newtonian flow O b. Plastic flow O c. Pseudoplastic flow O d. Rheopexy