1 This drug may have the effect of speeding up your heart rate. 2  I worry about the effect that violent movies may have on children. 3  Certain chemicals have been banned because of their damaging effect on the environment.  It's important to protect your skin from the harmful effects of the sun.
The CSF from all theses sources , as well as any formed in the central canal of the spinal cord, escapes from the fourth ventricle into the subarachnoid space through the median aperture (of Magendie) and lateral aperture (of Luschka).
If you are speaking of blood flow in peripheral arteries ( those supplying blood to arms and legs ) , the typical pattern of flow in a resting state is to accelerate quickly then stop and even briefly flow backwards as a pressure wave traveling faster than the blood itself reflects back from the smaller arterioles near the end of the pathway blood ...