“…Ethnic, dietary and social-economic factors (phenotypes), facilitators of microvascular lesions in target-organs such as brain, heart and kidneys, justify the increased severity of systemic arterial hypertension (SAH) of blacks through catecholamine, renal renin-angiotensin-calicrein, sodium channels, lipoprotein metabolism, hormones and tachikinines systems (genotype) 1,2, 14,15,[26][27][28][29][30][31] . The high mortality rate when crossing the Atlantic Ocean in slave ships has promoted a "natural selection" of black Africans: those more competent to retain sodium and water, that is, with a low renin level, would survive.…”