what gets contracted when fibers get shorter?
nerves h2o veins firm hugs fur biceps the skin density
A B C D E F G H
Muscles in the upper arm called biceps are used to flex the arm.
bicep contraction occurs when fibers get shorter
what gets contracted when fibers get shorter? (A) nerves (B) h2o (C) veins (D) firm hugs (E) fur (F) biceps (G) the skin (H) density