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.
Today, the main focus of pure biochemistry is in understanding how biological molecules give rise to the processes that occur within living cells, which in turn relates greatly to the study and understanding of whole organisms.