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.
Bicycle Chain Pitch. Bicycle Chain Pitch is a rather simple set of math. The pitch relates to the distance between abutting rollers or rivets: All bicycles made in recent times use a 1/2 pitch, thus 1/2 between every set of consecutive rivets. That has not always been true.