Alzheimer's disease primarily affects which part of the human body?

Alzheimer's disease primarily affects the brain. It is a neurodegenerative disorder characterized by a progressive loss of cognitive function, memory decline, and behavioral changes. The disease is caused by the buildup of abnormal protein clumps, called amyloid plaques and tau tangles, in the brain. These deposits lead to the death and malfunctioning of nerve cells in various regions of the brain, especially those involved in memory, thinking, and decision-making. As a result, individuals with Alzheimer's experience a gradual decline in their ability to remember, reason, and carry out daily activities, making the brain the central target and organ affected by this devastating disease.