Question

______ are long, wavy filaments that replace normal neurons and are characteristic of alzheimer’s disease.
○ neurofibrillary tangles
○ senile tangles
○ senile plaques
○ neurofibrillary plaques

Explanation:

In Alzheimer's disease, neurofibrillary tangles are abnormal structures made of long, wavy filaments (hyperphosphorylated tau protein) that disrupt normal neuron function. Senile tangles is not the standard term, senile plaques are extracellular deposits (not replacing neurons), and neurofibrillary plaques is an incorrect term. So the correct option is Neurofibrillary tangles.

Answer:

A. Neurofibrillary tangles