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.
Pitch is a term used to refer to the height or lowness of a sound. The pitch of a sound is determined by the frequency of the sound waves. A higher pitch has a higher frequency. The noted called A that is the first A above middle C is often used as a note for tuning instruments to match each other, and has the frequency of 440Hz.