Normal blood flows freely through comparatively relaxed vessels. Blood which is abnormally thickened is not only more viscous, it also may irritate the vessel walls, so diminishing their diameter and making passage more difficult. This automatically calls forth a greater effort by the heart, and the differential pressure the force of the pulse is increased. Within wide limits, such adjustments are made without the slightest awareness by, or discomfort to, the individual. Should unease be experienced, this probably indicates a situation beyond the wide normal tolerances, and suggests that remedial steps are due immediately.

The factors and mechanisms involved in high blood pressure are many and complex, but the following points cover the commonest and principal features: Excessive quantities of waste within the blood make it thick and viscous, so that it is difficult to circulate. The waste also often exerts an irritant effect on the blood-vessel walls, which react by becoming constricted. The same waste presents an abnormal task for the kidneys, and its elimination may cause congestion in these organs. The kidney distress reflects on their influential adjuncts the adrenals whose secretion of adrenalin exercises a major intensifying effect upon arterial tension.


Cardio & Blood