Sensation is caused by 
sensory nerve cells motor neurons Muscles in the upper arm. VOCs and NOx A hinged joint muscle contraction hormone secretion Time passing
A B C D E F G H
Sensation is caused by  (A) sensory nerve cells (B) motor neurons (C) Muscles in the upper arm. (D) VOCs and NOx (E) A hinged joint (F) muscle contraction (G) hormone secretion (H) Time passing