Definition of opacity for English Language Learners. : 1  the quality of a material that does not allow light to pass through it : the quality of being opaque. : 2  the quality of being difficult to understand or explain.
Research has shown that this is not true, and that brain cells can and do regenerate, especially in the areas related to learning, decision-making, visual recognition, and the way people perceive objects in space.weet. For a long time, scientists thought that it was impossible for brain cells to regenerate because they assumed that any new cells would disrupt the order of the brain.
About the liver. The liver is the largest organ of the human body. It does many jobs, including removing toxins from the blood, helping to digest food and fighting infections. It is the only organ in the body that can regenerate itself after damage. The cells that do the work in the liver are called hepatocytes.On average, each hepatocyte lives for around 200 to 300 days. In a healthy liver, hepatocytes can divide to make copies of themselves.t does many jobs, including removing toxins from the blood, helping to digest food and fighting infections. It is the only organ in the body that can regenerate itself after damage. The cells that do the work in the liver are called hepatocytes.