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- 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.Continually 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 specificityreversibilityWhich among the four choices below is NOT a typically way to measure muscle strength? Maximum force that can be exerted during an isometric contraction Maximum load that can be lifted at once Peak torque during an isokinetic contraction Number of repetitions before muscle fatigue sets in
- 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 contractionThere are many methods for testing muscle strength. Which in the list below are tests of isometric muscle strength? Select 2 correct answer(s) Computer-assisted testing Cable tensiometry Dynamometry One Rep MaxWhich of the following factors can contribute to a contracted muscle returning to its resting length? Select all that apply. Group of answer choices Gravity Reversal of the cross bridge cycle Elastic recoil of the tendons Contraction of antagonist muscles
- Indicate which of the following are true. Chronically shortened muscles will lose sarcomeres in series in order to maintain ideal amounts of myofilament overlap. Contractile force is proportional to the length of a muscle. Muscle organ contraction is all or nothing. Muscle cells are surrounded by an endomysium. Actin is the thick filament and Z-lines are where the cross-bridges zig-zag to adjacent actin filaments. Muscles with fewer motor units are weaker, i.e., capable of less force. A nerve impulse, calcium, and ATP are necessary for muscle contraction. Tendons attach bones to bones and help to limit the range of motion at joints. Muscle tissue is very dynamic and will respond to chronic stress by becoming stronger (making more myofilaments), chronic contraction by becoming shorter (losing sarcomeres in series), and stretching by becoming longer (adding sarcomeres in series). Myofilaments are actually long strands of proteins.Compare the force produced by a muscle over timewhen it is stimulated by a single twitch stimulus with theforce produced by multiple stimuli at low frequency, and thenwith the force produced when the stimulation frequency isincreased.The 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.
