heart left ventricle molecular composition trait heart left ventricle natriuretic peptide A amount 2013-10-08T02:16:41Z 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. Trait.ontology VT:0010596 caripark heart left ventricle ANF amount heart left ventricle NPPA amount heart left ventricle atrial natriuretic factor amount