Changing levels of certain substances in the blood, such as sodium, can cause confusion. Increased heart rate...heart palpitations, which feel like your heart is racing or throbbing. To make up for the loss in pumping capacity, the heart beats faster.
The pitch plane of a pair of gears is the plane perpendicular to the axial plane and tangent to the pitch surfaces. A pitch plane in an individual gear may be any plane tangent to its pitch surface.
An Example of a roof pitch would be a 6/12 pitch which means that the roof rises 6  for every 12 inward towards the peak (or ridge). There are two suggested ways to measure a roof pitch. The first is from the top of the roof. Simply mark a level at 12.