8 Which lever system is considered a biomechanical advantage to the human and why?

The human body uses all three types of lever systems: first class lever, second class lever, and third class lever. However, the third class lever system is considered a biomechanical advantage to the human body.

Here's why:

1. Definition: In a third class lever system, the effort is between the load and the fulcrum. An example of this in the human body is the bicep curl.

2. Speed and Range of Motion: Third class levers are designed for speed and range of motion rather than force. This is beneficial in many human movements, such as throwing or kicking a ball, where speed and range of motion are more important than force.

3. Muscle Advantage: Third class levers in the human body allow muscles to pull against a bone, causing the bone to act as a lever. This allows for greater movement and control, which is a significant advantage in many physical activities.

4. Energy Efficiency: While third class levers require more effort to move a certain load, they are more energy efficient. This is because the effort arm (the distance from the effort to the fulcrum) is usually shorter than the load arm (the distance from the load to the fulcrum), which means less force is needed to move the load.

In conclusion, the third class lever system is considered a biomechanical advantage to the human body due to its ability to provide speed and range of motion, muscle advantage, and energy efficiency.