One of the neurotransmitters playing a major role in addiction is dopamine. Dopamine affects brain processes that control movement, emotional response, and the ability to experience pleasure and pain. Regulation of dopamine plays a crucial role in our mental and physical health. Cocaine and other drugs of abuse can alter dopamine function. Such drugs may have different action depending on which dopamine receptors the drugs stimulate or block, and how well they mimic dopamine.
Anatomy Lesson: muscles of the neck
Anatomy Lesson: Human Kidney
The Cervical Vertebrae on X-ray
An x-ray of a femur fracture is shown. Close to one third of all injuries during childhood are sports-related, and contact sports such as football account for the majority.