A dental assistant. hold a current Arizona Board-approved certificate in radiology. To obtain a certificate, one must: 1a. Pass the national DANB Radiation Health and Safety (RHS) exam, AND. 1b. Receive the Arizona Radiologic Proficiency Certificate, issued by DANB, or. 2a.
Parkinson's disease (PD) is a type of movement disorder. It happens when nerve cells in the brain don't produce enough of a brain chemical called dopamine. Sometimes it is genetic, but most cases do not seem to run in families. Exposure to chemicals in the environment might play a role.
Parkinsonâs is a chronic, progressive disease characterized by motor symptoms including tremors, muscle stiffness, and slowed movement. About a third of patients also develop dementia during the later stages of the disease. There is no cure for Parkinsonâs, but the drug levadopa and other medications can control symptoms for many years.