what is an anp
Medical Definition of ATRIAL NATRIURETIC PEPTIDE. : a peptide hormone secreted by myocytes of the cardiac atria that in pharmacological doses promotes salt and water excretion and lowers blood pressureâabbreviation ANP.Britannica.com: Encyclopedia article about atrial natriuretic peptide. a peptide hormone secreted by the cardiac atria that in pharmacological doses promotes salt and water excretion and lowers blood pressure âcalled also atrial natriuretic factor. ADVERTISEMENT.