What is the primary action of the biceps brachii?

Prepare for AAMI Anatomy 1. Utilize flashcards, multiple choice questions with explanations, and detailed study aids. Succeed on your exam!

Multiple Choice

What is the primary action of the biceps brachii?

The biceps brachii is a two‑joint muscle that crosses the elbow and forearm. Its main action is to flex the elbow while also supinating the forearm. When the forearm is in a supinated position, contraction of the biceps pulls the forearm up and turns the palm upward. It does not extend the elbow (that’s the triceps), nor does it flex the wrist (that’s done by wrist flexors), and it does not pronate the forearm (that’s the job of pronator muscles; the biceps actually supinates). While it can assist with shoulder flexion, its defining action at the forearm level is elbow flexion with forearm supination.

The biceps brachii is a two‑joint muscle that crosses the elbow and forearm. Its main action is to flex the elbow while also supinating the forearm. When the forearm is in a supinated position, contraction of the biceps pulls the forearm up and turns the palm upward. It does not extend the elbow (that’s the triceps), nor does it flex the wrist (that’s done by wrist flexors), and it does not pronate the forearm (that’s the job of pronator muscles; the biceps actually supinates). While it can assist with shoulder flexion, its defining action at the forearm level is elbow flexion with forearm supination.

More practice questions