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.
Collective pitch-throttle coordination Collective pitch is the primary control for manifold pressure; the throttle is the primary control for RPM. Since the collective pitch control also influences RPM, and the throttle also influences manifold pressure, each is considered to be a secondary control of the other's functions.