Which figure exhibits a contraction of the biceps brachii muscle in which its length increases?

Question

Quizplus · Accepted Answer

In figure B, the biceps brachii muscle is undergoing an eccentric contraction, which means that the muscle is lengthening while still under tension. This is evident from the fact that the muscle is attaching to a weight that is pulling the arm downwards, causing the biceps to work against the force of gravity. As a result, the biceps is contracting while lengthening, producing an eccentric contraction. Figures A and C show the biceps undergoing concentric contractions, which is when the muscle shortens while under tension.

Which Figure Exhibits a Contraction of the Biceps Brachii Muscle