In this article. Dystonia is a movement disorder in which a person's muscles contract uncontrollably. The contraction causes the affected body part to twist involuntarily, resulting in repetitive movements or abnormal postures. Dystonia can affect one muscle, a muscle group, or the entire body. Cervical dystonia affects the neck muscles, causing the head to twist and turn or be pulled backward or forward. 2  Cranial dystonia affects the head, face, and neck muscles. 3  Oromandibular dystonia causes spasms of the jaw, lips, and tongue muscles. 4  This dystonia can cause problems with speech and swallowing.
Biochemistry is the science in which chemistry is applied to the study of living organisms and the atoms and molecules which comprise living organisms. Take a closer look at what biochemistry is and why the science is important. The many and diverse applications of biochemistry include pharmacology, genetics, immunology, bioinformatics, environmental science, forensics, toxicological studies and food science.
What Chemists and Materials Scientists Do. Chemists and materials scientists study substances at the atomic and molecular levels and the ways in which the substances interact with one another. They use their knowledge to develop new and improved products and to test the quality of manufactured goods.