Answer the following question: Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Muscles in the upper arm called biceps are used to flex the arm. Given the two facts above, what gets contracted when fibers get shorter?

I. nerves.
II. h2o.
III. veins.
IV. firm hugs.
V. fur.
VI. biceps.
VII. the skin.
VIII. density.
Answer:
VI.