The motor point is usually located at the center of the muscle mass where the motor nerve enters the muscle.
Definition A carcinogen is defined as something that can directly cause cancer. This can be a chemical substance, a virus, or even the medications and radiation we use to treat cancer. While many cancers are caused by a carcinogen or combination of carcinogens, the tendency to develop cancer may also be inherited as part of our genome.
carcinogen. any natural or artificial substance that can produce or trigger cancer, as arsenic, asbestos, ionizing radiation, ultraviolet rays, x rays, and many derivatives of coal tar. â carcinogenic, adj.