what contracts when fibers get shorter?
strength strong h2o bushes density wheat firm hugs biceps
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 contracts when fibers get shorter? (A) strength (B) strong (C) h2o (D) bushes (E) density (F) wheat (G) firm hugs (H) biceps