Question

multiple choice question

the forearm acts as what type of lever when you flex your elbow?

first-class
third-class
second-class

Explanation:

Identify the components of the lever system

Using the Skeletal Lever Systems knowledge point

• Fulcrum (F): The elbow joint acts as the pivot point.
• Effort (E): The biceps brachii muscle inserts on the radial tuberosity, pulling upward between the elbow and the hand.
• Resistance (R): The weight of the forearm and any object held in the hand acts downward at the far end.

Determine the lever class

Using the Skeletal Lever Systems knowledge point

• In this arrangement, the effort (E) is applied between the fulcrum (F) and the resistance (R).
• A system where the effort lies in the middle is classified as a third-class lever.

Answer:

• First-class
• Third-class (Correct answer)
• Second-class