heart left ventricle molecular composition trait heart left ventricle natriuretic peptide A amount heart left ventricle ANF amount caripark The proportion, quantity, or volume in the left lower chamber of the heart of the peptide hormone NPPA, which is involved in the control of extracellular fluid volume and electrolyte homeostasis. heart left ventricle atrial natriuretic factor amount VT:0010596 Trait.ontology 2013-10-08T02:16:41Z heart left ventricle NPPA amount