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Are precise movements controlled by small motor units?
Yes, precise movements are controlled by small motor units. Small motor units are composed of fewer muscle fibers and are responsible for fine motor control and intricate movements. These motor units are recruited for tasks that require precision and accuracy.
Which principle states that motor units are recruited in order to their recruitment and firing rates?
Size Principle
Which principle states that motor units are recruited in order according to their recruitment thresholds and rates?
Size Principle
Why does varying stimulus strength affects the twitch force?
Varying stimulus strength affects twitch force because it determines the number of motor units that are recruited to contract the muscle fibers. As the stimulus strength increases, more motor units are recruited, leading to greater force production. Conversely, lower stimulus strength recruits fewer motor units and results in weaker contractions.
Which principle states that motor units are recruited in order according to their recruitment thresholds and firing rates?
Size Principle
Which of the following would be recruited later in muscle stimulation when contractile strength increases?
Um are you an idiot, you never put choices! A) large motor units with small, highly excitable neurons B) motor units with the longest muscle fibers C) many small motor units with the ability to stimulate other motor units D) motor units with larger, less excitable neurons
What would be recruited later in the muscle stimulation when the contractile strength increases?
motor units with larger, less excitable neurons
When holding an object does the number of motor units remain the same and are the same units used for the duration of holding the object?
The number of motor units involved in holding an object can vary depending on the weight and complexity of the task. Different motor units may be recruited as needed to maintain force and control. Some motor units may be more fatigable and switch during sustained tasks, but this can depend on the individual and the specific task.
What does recruitment and frequency of stimulation affect?
Recruitment affects the number of motor units activated in a muscle, while frequency of stimulation affects the force generated by those motor units. Increasing recruitment leads to more muscle fibers being recruited, increasing force production, while increasing frequency of stimulation produces stronger muscle contractions by increasing the rate at which motor units are activated.
In motor unit summation how many motor units are required to lift weight of 160 and 80?
The amount of motor units that is needed to lift 160 pounds will be greater that the number required when lifting 80 pounds. This is due to the nervous system reading the situation and determining the number of units required. The smaller the muscle, the more delicate the control can be.
When holding an object steady does the number of motor units remain the same?
Yes it does. As long as the effort to hold the object in a steady position remains the same, then the number of motor units needed to keep it in that position remains the same. It is only when the force, or effort, required to do a specific task changes does the number of motor units needed to accomplish the task change.
What is the order of motor unit recruitment in a high rep set?
In a high-rep set, motor unit recruitment typically follows the size principle, where smaller motor units are recruited first before larger ones. Initially, low-threshold, fatigue-resistant type I muscle fibers are activated to sustain endurance. As the set progresses and fatigue increases, larger motor units, which include fast-twitch type II fibers, are recruited to generate greater force. This sequential recruitment helps optimize performance and efficiency during prolonged activities.
