Red blood cell 'traffic' contributes to changes in brain oxygenation

Adequate blood flow supplies the brain with oxygen and nutrients, but the oxygenation tends to fluctuate in a distinct, consistent manner. The root of this varied activity, though, is poorly understood. Now, researchers have identified one cause of the fluctuations: inherent randomness in the flow rate of red blood cells through tiny blood vessels called capillaries.

from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/07/210715142347.htm