Contraction of Muscle Results in Movement Because ________

Question

Contraction of muscle results in movement because ________.
A) at a joint, the bone acts as a pulley and the joint serves as a lever
B) at a joint, the bone acts as a lever, the joint serves as a fulcrum, and effort is generated by muscle attached to bone
C) at a joint, the bone acts as a fulcrum and the joint serves as a pulley
D) at a joint, the bone acts as a fulcrum and the joint serves as a lever

Accepted Answer

When a muscle contracts, it generates a force that pulls on a bone. This bone acts as a lever and the joint serves as a fulcrum. The effort generated by the muscle causes movement around the joint. This is known as the lever system of movement, which is best described by option B.