In the middle cerebral artery blood flow at rest is 73.7 cm/s. After a period of 3 minutes of hyperventilation, blood flow in the same artery decreases to 37.6 cm/s. This is published work.
Vena cava measures: Peak velocities during ventricular systole ranged from 30 to 45 cm/sec in the inferior, and from 10 to 35 cm/sec in the superior, vena cava, also published.
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