Lack of control of the environment is often pinpointed as a cause of frustration and stress in confined animals. When the animal cannot control things, such as the feeding time or the lighting program, and when it cannot escape from things it finds unpleasant, it often behaves in a manner that indicates frustration.
Cavitation can also cause excessive pump vibration, which could damage pump bearings, wearing rings, and seals. A small number of centrifugal pumps are designed to operate under conditions where cavitation is unavoidable.
Give the mechanism for the changes in heart rate, cardiac contractility and SVR caused by the Valsalva maneuver: VM causes a decrease in venous return, resulting in decrease in preload and stroke volume -- and increase heart rate. This will then cause a decrease in MAP and pulse pressure, triggering the BR reflex. The BR reflex will increase HR, SVR, contractility, and venoconstriction. In response to hemorrhage, the BR reflex causes constriction of veins and arteries throughout the body, including the skin. However, if one finds themself in a desert one often sweats, indicating dilation of vessels in the skin.