a clear opposite, and so are treated in pairs.

Flexion and extension

Flexion and extension are movements that affect the angle between two parts of the body. These terms come from the Latin words with the same meaning.

Flexion is a bending movement that decreases the angle between a segment and its proximal segment. For example, bending the elbow, or clenching a hand into a fist, are examples of flexion. When a person is sitting down, the knees

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