17 Questions
What is the law that states the nervous system activates the fewest muscles or muscle fibers possible for a given joint action?
Law of Parsimony
What is the purpose of the hierarchic recruitment pattern?
To activate the fewest muscles possible for a given joint action
What type of muscle recruitment pattern exists for the elbow extensors?
Hierarchic recruitment pattern
What is the role of the anconeus and medial head of the triceps?
To control lower level extensor torque
Which muscles control lower level extensor torque for the elbow joint?
Anconeus and medial head of the triceps
Why is the larger, polyarticular, long head of the triceps selected for dynamic or highly resisted extensor torque?
Because it can generate more force
What is the downside to using additional muscular forces to neutralize the undesired shoulder extension potential of the long head of the triceps?
It requires more energy
Which muscle is selected for dynamic or highly resisted extensor torque for the elbow joint?
Long head of the triceps
When are tasks with low-level force demands usually accomplished?
When using one-joint muscles
Why does the nervous system activate the fewest muscles or muscle fibers possible for a given joint action?
To conserve energy
Why are neutralizer muscles necessary for larger polyarticular muscles?
To prevent undesired movements
What type of muscles are often used for tasks with low-level force demands?
One-joint muscles
What type of muscles are recruited as force demands increase?
Multi-joint muscles
What are neutralizer muscles necessary for in larger polyarticular muscles?
Counteracting undesired actions
Which muscle controls lower level flexor torque for the elbow joint?
Brachialis
Which muscle is selected for dynamic or highly resisted flexor torque for the elbow joint?
Biceps brachii
What is the principle behind the nervous system activating the fewest muscles or muscle fibers possible for a given joint action?
Law of Parsimony
Study Notes
- The nervous system activates the fewest muscles or muscle fibers possible for a given joint action.
- The law of parsimony states this method of muscle group activation.
- The hierarchic recruitment pattern exists for the elbow extensors.
- The small anconeus and medial head of the triceps control lower level extensor torque.
- The larger, polyarticular, long head of the triceps is selected for dynamic or highly resisted extensor torque.
- This pattern of muscle recruitment makes practical sense from an energy perspective.
- Additional muscular forces would be required to neutralize the undesired shoulder extension potential of the long head of the triceps.
- Tasks with low-level force demands are often accomplished by one-joint muscles.
- Larger polyarticular muscles are recruited as force demands increase.
- Neutralizer muscles are necessary for larger polyarticular muscles.
Test your knowledge of muscle activation and recruitment patterns in the human body with this quiz. From the law of parsimony to the hierarchic recruitment pattern, learn about the specific muscles involved in joint actions and the practical reasons behind their activation. Whether you're a fitness enthusiast or a student of anatomy and physiology, this quiz will challenge your understanding of muscle function and energy efficiency. Keywords: muscle activation, recruitment patterns, joint actions, anatomy, energy efficiency.
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