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.
If you have gears with a diametral pitch of 12, a 12-tooth gear will have a pitch diameter of 1, while a 24-tooth gear will have a p.d. of 2. The circular pitch (p) is the distance along the pitch diameter from the face of one tooth to the corresponding face of an adjacent tooth.