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left ventricle
which part of the heard has the thickest myocardium
hemoglobin
erythropoietin helps raise ____ levels in the blood
macrophages
break down red blood cells in the spleen
thrombin
converts fibrinogen to fibrin during clot formation
calcitonin
lowers blood calcium levels
aortic and pulmonic
semilunar valves
atrioventricular valve
the first “lub” sound occurs when the ____ closes