Dictionary > Alzheimers disease

Alzheimers disease

Alzheimers disease
(Science: disease) a progressive, neurodegenerative disease characterized by loss of function and death of nerve cells in several areas of the brain leading to loss of cognitive function such as memory and language. The cause of nerve cell death is unknown but the cells are recognized by the appearance of unusual helical protein filaments in the nerve cells (neurofibrillary tangles) and by degeneration in cortical regions of the brain, especially frontal and temporal lobes.
Alzheimers disease is the most common cause of dementia. A progressive form of presenile dementia that is similar to senile dementia except that it usually starts in the 40s or 50s. The first symptoms are impaired memory which is followed by impaired thought and speech and finally complete helplessness. A disease of the central nervous system, with symptoms including memory loss which increases over time until the body is no longer able to function due to the body’s inability to process the electrical signals via the degrading nervous system.


You will also like...

Psychiatry and mental disorders
Psychiatry & Mental Disorders

Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..

river
Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

vitamins
A Balanced Vitamin Diet – Vitamins A – K

A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

Lentic community
Freshwater Communities & Lentic Waters

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

green plant cells
Plant Cells vs. Animal Cells

Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..

Growth Patterns
Growth Patterns

This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..