In the Human Body,what is the Fulcrum in a Lever

Question

In the human body,what is the fulcrum in a lever system?
A)The fulcrum is the angle of the movement.
B)The fulcrum is the effort generated by muscle contractions.
C)The fulcrum is the weight of the body part being moved.
D)The fulcrum is the joint at which movement occurs.

Accepted Answer

In a lever system within the human body, the fulcrum is the joint at which movement occurs, allowing for the movement of a body part or limb. For example, when the biceps muscle contracts, it exerts an effort force on the forearm bone (the load), which rotates around the elbow joint (the fulcrum), resulting in a bending of the arm.