DAA Exam 2 Practice 2026 - Free Data Analysis and Algorithms Practice Questions and Study Guide

The action to rule out is abduction of the arm at the shoulder joint. The biceps brachii crosses two joints, attaching from the scapula to the radius, so its primary roles are elbow flexion and forearm supination. It can assist with shoulder flexion because it crosses the shoulder, but it does not pull the arm away from the body to achieve abduction. Abduction at the shoulder is mainly the job of the deltoid (and the supraspinatus in the initial phase). So, although the biceps can help with some shoulder movement, it does not perform shoulder abduction, making that the action it does not accomplish.