Neurovascular Coupling

Neurovascular coupling describes how neural activity and blood flow work together to maintain oxygen and nutrient delivery to active regions of the brain. When neurons increase their firing, surrounding cells release signaling molecules that instruct nearby blood vessels to widen. Astrocytes form an important link between neural activity and vascular response by transmitting chemical signals to smooth muscle cells on vessel walls. This coordinated process ensures that active brain regions receive adequate glucose and oxygen to sustain metabolism. Disruption of neurovascular coupling can reduce tissue perfusion, alter synaptic communication, and impair cognitive functions. Changes in vascular reactivity also influence waste clearance and contribute to metabolic stress within neural tissue. Abnormalities in this mechanism are associated with stroke progression, neurodegeneration, and age-related brain changes.

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