How Brain Cells Are Affected By Alzheimer’s Disease This animated video from the Alzheimer's Society in the U.K. explains how brain cells work. Brains are made up of billions of nerve cells that are all communicating with each other by transmitting electrical signals. If nerve cells are starved of oxygen or vital nutrients they become unable to transmit the electrical signals and those brain cells die. MORE: Look inside the brain of an Alzheimer's disease patient. Nerve cells in the brain are not replaced when they die and if too many nerve cells die, it can lead to dementia or Alzheimer's disease. The area of the brain affected by nerve cell death will have
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