Question

Third-class lever in the body (most common) is:

a) Elbow Flexion
b) Neck Rotation
c) Plantar Flexion
d) Knee Extension

Answer 1

The correct answer is a) Elbow Flexion. In the human body, a third-class lever is the most common type of lever. It consists of a fulcrum located at one end, an effort applied at the other end, and the load in between.

Step-by-step explanation:

The correct answer is a) Elbow Flexion.

In the human body, a third-class lever is the most common type of lever. It consists of a fulcrum located at one end, an effort applied at the other end, and the load in between. In the case of elbow flexion, the fulcrum is the elbow joint, the effort is applied by the biceps brachii muscle, and the load is the weight of the forearm and any objects held in the hand.

During elbow flexion, the biceps brachii muscle contracts, pulling on the radius bone of the forearm. This causes a decrease in the angle between the upper arm and the forearm, resulting in the bending of the elbow. Elbow flexion is a common movement in activities such as lifting, curling, and throwing.