Hi could you please list several examples of our three class lever types in the

Question

Hi could you please list several examples of our three class lever types in the body. All the examples I come across are the same... examples for class l is always atlantooccipital, class ll is opening mouth or pushups, and class lll is the bicep curl. Can you list others of each type that are less obvious!! Please and thank you in advance! Hi could you please list several examples of our three class lever types in the body. All the examples I come across are the same... examples for class l is always atlantooccipital, class ll is opening mouth or pushups, and class lll is the bicep curl. Can you list others of each type that are less obvious!! Please and thank you in advance!

Explanation / Answer

Bones, ligaments, and muscles are the structures that form levers in the body to create human movement.

Class I : An example of a first-class lever is a pair of pliers or scissors. First-class levers in the human body are rare. One example is the joint between the head and the first vertebra (the atlantooccipital joint)

Class II: The weight (resistance) is located between the axis (fulcrum) and the force. The most obvious example is a wheelbarrow, where a weight is placed in the bed of the wheelbarrow between the wheel (axis) and the hands of the person using the wheelbarrow (force). In the human body, an example of a second-class lever is found in the lower leg when someone stands on tiptoes. The axis is formed by the metatarsophalangeal joints, the resistance is the weight of the body, and the force is applied to the calcaneus bone (heel) by the gastrocnemius and soleus muscles through the Achilles tendon.

Class III: force is applied between the resistance (weight) and the axis (fulcrum). The axis is the end of the handle where the person grips with one hand. The other hand, placed somewhere along the shaft of the handle, applies force. one example can be illustrated in the elbow joint . The joint is the axis (fulcrum). The resistance (weight) is the forearm, wrist, and hand. The force is the biceps muscle when the elbow is flexed.

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