The defining characteristic of Alzheimer's disease is the prevalence in brain tissue of ___________ which are called plaques.

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The defining characteristic of Alzheimer's disease is the prevalence of plaques in the brain tissue. These plaques are abnormal deposits of beta-amyloid protein that accumulate in the spaces between nerve cells and can lead to the death of neurons. As a result, individuals with Alzheimer's disease typically exhibit symptoms such as memory loss, cognitive impairment, and changes in behavior and personality. Tangled clumps of neurons and disintegrating nerve cell branches are also present in the brains of individuals with Alzheimer's disease, but these are known as neurofibrillary tangles, which are a secondary hallmark of the disease.

The Defining Characteristic of Alzheimer's Disease Is the Prevalence in Brain