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Questions and Answers
What is a lever?
What is a lever?
A lever is a rigid structure that moves around a fixed point, the fulcrum.
What role does the resistance (load) (L) play in a lever system?
What role does the resistance (load) (L) play in a lever system?
The resistance (load) opposes movement.
What role does the effort (E) play in a lever system?
What role does the effort (E) play in a lever system?
The effort causes movement.
In the human body, what serves as levers?
In the human body, what serves as levers?
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In the human body, what serves as fulcrums?
In the human body, what serves as fulcrums?
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What is the resistance in a lever system involving the human body?
What is the resistance in a lever system involving the human body?
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What role does muscle contraction play in a lever system?
What role does muscle contraction play in a lever system?
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How does the distance of muscle attachment from the joint affect the force produced?
How does the distance of muscle attachment from the joint affect the force produced?
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What advantage does a muscle have if it attaches closer to the joint?
What advantage does a muscle have if it attaches closer to the joint?
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What is mechanical advantage in the context of lever systems?
What is mechanical advantage in the context of lever systems?
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What is necessary for the production of movement around a joint?
What is necessary for the production of movement around a joint?
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Where is the origin of a muscle's tendon usually located?
Where is the origin of a muscle's tendon usually located?
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What is the term for the attachment of a muscle's tendon to the stationary bone?
What is the term for the attachment of a muscle's tendon to the stationary bone?
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How must one bone behave to enable joint movement?
How must one bone behave to enable joint movement?
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What describes the bone that does not move during muscle contraction?
What describes the bone that does not move during muscle contraction?
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Study Notes
Lever Systems and Leverage
- A lever is a rigid structure that moves around a fixed point called the fulcrum (F)
- Two forces act on a lever: resistance (load) (L) opposing movement and effort (E) causing movement
Bones as Levers and Joints as Fulcrums
- Bones serve as levers and joints serve as fulcrums
- In joints, one bone must be stationary while another bone moves
Origins and Insertions
- The attachment of a muscle's tendon to the stationary (usually proximal) bone is called the origin
- The attachment of a muscle's tendon to the moving bone is called the insertion
Mechanical Advantage
- The muscle attached farther from the joint produces the most force
- The muscle attached closer to the joint has a greater range of motion and faster speed
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Description
Learn about levers, fulcrums, and how bones and joints work together as a system. Understand the concepts of resistance and effort in lever systems.
