Question

multiple choice question

within the skeletal anatomy, what supplies the effort?

• the resistance arm
• muscle contraction
• the effort arm

Explanation:

Define skeletal lever systems

In human biomechanics, bones act as levers, joints serve as fulcrums, and skeletal muscles provide the force to move these levers. Using the Kinesiology Definition knowledge point, we analyze how movement is generated across joints.

Identify the source of effort

The "effort" in a biological lever system is the force applied to overcome resistance. This active force is generated directly by the physiological shortening of muscle fibers, which is known as muscle contraction.

Analyze the incorrect options

The "effort arm" and "resistance arm" are distances from the fulcrum to the points of force application, not the active forces themselves. Therefore, they do not supply the effort.

Answer:

• The resistance arm
• Muscle contraction (Correct answer)
• The effort arm