Why does the risk of neurodegenerative diseases, such as Alzheimer's, increase with age concerning amyloid-beta plaques and tau protein tangles?

💡 Explanation

The risk increases because the efficiency of autophagy, the process responsible for clearing misfolded proteins and damaged organelles, declines with age. Therefore, toxic protein aggregates like amyloid-beta and tau accumulate, leading to neurodegeneration, rather than a direct overproduction of neurotransmitters or impermeable blood-brain barrier.

• Why does bacterial overgrowth cause malabsorption in the small intestine?
• Following mRNA vaccination, which mechanism explains prolonged antibody production against the target antigen in the absence of continuous antigen exposure?
• If a researcher introduces a mutation disrupting IRS-1 phosphorylation in skeletal muscle cells of a patient with type 2 diabetes already exhibiting insulin resistance, which consequence follows?
• Which effect occurs when decreased tubular fluid flow disrupts renal electrolyte balance?
• Why does an elderly person in a heatwave risk hyperthermia more than a younger person, even with similar environmental exposure?
• Why does excessive fibrinolysis increase the risk of hemorrhage following tissue plasminogen activator (tPA) administration for stroke?