When you plug your device into a charging socket or wall charger, the USB controller in your device talks to the USB controller attached to the socket/wall charger â or, if no controller is available, the device reads the voltage flowing across the four USB pins.
The volume of the ventricles is about 25 ml. CSF is produced at a rate of 0.2 - 0.7 ml per minute or 600-700 ml per day. The circulation of CSF is aided by the pulsations of the choroid plexus and by the motion of the cilia of ependymal cells.
The metabolic hypothesis states that CBF reduction stimulates vasoactive substance release from the brain that then stimulates cerebral vessel dilatation.. the volume of intravascular blood in the brain in milliliters) and CBF (the volume of blood that passes through the brain per unit time in mL/min) [7]: CBF = CBV/Ï This equation implies that change in vascular diameter will affect CBV but not necessarily CBF if mean transit time (Ï) 26 â¢ also is altered.