Neurovascular coupling

神经血管耦合

Place · Level 3

Connected to · 1

regulates · 1

Cognitive Aging & Reserve
When small-artery walls cannot hear messengers, the local opening lags; white-matter cables feel ischaemia first. One road into the cognitive-aging island's slowed white-matter insulation starts here.

放过电, 血才过来

Stop 1/4

Fire first, blood follows

The brain has no fuel tank. The moment a neuron fires, ion pumps start burning , and sugar and oxygen have to arrive in seconds. The body does not pressurize the whole head. It opens the capillaries next to the patch that just fired.

Firing raises local carbon dioxide, potassium and adenosine. Those messengers tell the nearby tubes: work is happening here, open a little. Blood brings glucose and oxygen; waste is flushed.

So the bright patch on functional MRI is blood, not electricity. Electricity is milliseconds; the blood response lags. What you see is fuel matching activity, not a brain blushing from injury.

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Educational content, not medical advice — consult a clinician.

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Neurovascular coupling

神经血管耦合

Place · Level 3

Connected to · 1

regulates · 1

Cognitive Aging & Reserve
When small-artery walls cannot hear messengers, the local opening lags; white-matter cables feel ischaemia first. One road into the cognitive-aging island's slowed white-matter insulation starts here.

放过电, 血才过来

Stop 1/4

Fire first, blood follows

The brain has no fuel tank. The moment a neuron fires, ion pumps start burning , and sugar and oxygen have to arrive in seconds. The body does not pressurize the whole head. It opens the capillaries next to the patch that just fired.

Firing raises local carbon dioxide, potassium and adenosine. Those messengers tell the nearby tubes: work is happening here, open a little. Blood brings glucose and oxygen; waste is flushed.

So the bright patch on functional MRI is blood, not electricity. Electricity is milliseconds; the blood response lags. What you see is fuel matching activity, not a brain blushing from injury.

Read story

Educational content, not medical advice — consult a clinician.