What Is ANP (Atrial Natriuretic Peptide) And BNP (B Type Natriuretic Peptide) In 3 Minutes | USMLE
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Atrial natriuretic peptide (ANP) or Atrial natriuretic factor (ANF) is a peptide hormone which reduces an expanded extracellular fluid (ECF) volume by increasing renal sodium excretion. ANP is synthesized, and secreted by cardiac muscle cells in the walls of the atria in the heart. These cells contain volume receptors which respond to increased stretching of the atrial wall due to increased atrial blood volume. ANP is one of a family of nine natriuretic peptides: seven are atrial in origin.