If this is for sport science or a similar subject then extension is defined as the movement where the angles between the bones increase.
The answer is PET (positron emission tomography) scan. It lets doctors measure a variety of activity
including blood flow, blood volume, oxygen usage, tissue pH (acidity), glucose
(sugar) metabolism, and drug activity. PET is very beneficial in watching the
activity of cancerous tumors. Because malignant cells grow at such a fast degree,
they absorb more sugar than normal cells. Sugar can be added to a radioactive
substance, and the PET scan can detect the areas of the brain through which the
sugar flows. This way the doctor can give a preview into how aggressive a tumor
is or how its growth is slowed by treatment remedies.
Well if he is eating any unhealthy food I would start by cutting down on all of the sweets,junk food and othe unhealthy stuff.second I would advise he excercises more. An hour or two each day should do just fine for him to lower the risk.
