Sign up for our email newsletter. This activity is a fun and surprising way to find out! We call these voluntary contractions, or voluntary movements. Introduction Have you ever wondered how a decision to move your arm can make your arm move? You might become aware of an impending sneeze and be able to suppress it or you might deliberately touch something hot and your brain will order your arm to stay extended before you feel the pain. You have free article s left. Push for about a minute, step away and relax your arms.
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