Xa igazi lihamba lisuka kwi-atria lisiya kwii-ventricles lihamba ngemingxunyana yentliziyo eyi-valve. Xa igazi liphuma kwii-ventricles lihamba ngezi-valves. Ii-valves ziqinisekisa okokuba igazi lihamba kuphela ngendlela enye xa lingena naxa liphuma.