It was explained to me later that when they try and revive a person, they force fluids into the body to get the heart and blood circulating, often more than 20 pounds of fluid.

Chewing on a piece or two of gum, it seems, helps force fluids back into the stomach and flood the esophagus with alkaline saliva, neutralizing acids that cause the characteristic burning sensations.

Fluid shear is the mechanical force exerted by the movement of fluids over cell surfaces and has been found to play an important role in cellular differentiation, development and function.