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Unformatted text preview: (vasoconstrictors) o aldosterone & ADH (increase blood volume)- blood pressure lowered by : o activation of baroreceptors (& medulla oblongata) o atrial natriuretic peptide (ANP) (inhibits aldosterone & ADH) Alterations in Blood Pressure- Hypotension : low blood pressure (systolic BP below 100 mm Hg) o often due to individual variations, fluctuations o chronic hypotension may be indicative of poor nutrition- Hypertension : high blood pressure (sustained arterial pressure > 140/90) o Acutely due to exercise, illness o Chronic hypertension may be indicative of increased peripheral resistance (often due to vessel blockage) Primary hypertension : most cases; no known cause… factors include diet, obesity, age, race heredity, stress & smoking Secondary hypertension : ~ 10% of cases; due to disorders such as arteriosclerosis & hyperthyroidism PAGE4...
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- Fall '10