_____ are protein fibers that develop in a neuron's nucleus, decreasing its ability to function properly.

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Tangles are protein fibers, specifically tau proteins, that form within a neuron's nucleus and interfere with its ability to function properly. Plaques and beta-amyloid proteins are associated with Alzheimer's disease, but they do not form within the neuron's nucleus. Synapses are the small gaps between neurons where communication occurs and are not related to the formation of protein fibers.

_____ Are Protein Fibers That Develop in a Neuron's Nucleus