Multiple Choice
The most common lever in the human body is the __________.
10. Muscles
Levers
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The majority of the lever systems in the arms and legs are third-class levers; there are few second-class levers. Knowing this which of the following statements is correct?
A
The muscles of the arms and legs usually work at a mechanical disadvantage.
B
These joints will have relatively small range of motion.
C
Most movements of the arms and legs prioritize power over speed.
D
The fulcrum will most often be placed between the effort and the load.
Verified step by step guidance1
Understand the types of levers: In anatomy, levers are classified into three types based on the arrangement of the fulcrum, effort, and load. Third-class levers have the effort applied between the fulcrum and the load.
Identify the characteristics of third-class levers: Third-class levers are known for providing a mechanical disadvantage, meaning they require more effort to move a load but allow for greater speed and range of motion.
Analyze the statement about mechanical disadvantage: Since third-class levers are prevalent in the arms and legs, the muscles in these areas often work at a mechanical disadvantage, prioritizing speed and range of motion over power.
Evaluate the range of motion: Third-class levers typically allow for a larger range of motion, contrary to the statement that these joints will have a relatively small range of motion.
Consider the placement of the fulcrum: In third-class levers, the fulcrum is not placed between the effort and the load; this arrangement is characteristic of first-class levers.
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