Natriuretic peptides are hormones produced by the heart, primarily in response to increased blood volume and pressure. They help regulate fluid balance and blood pressure by promoting the excretion of sodium through the kidneys, a process known as natriuresis. This action helps to reduce blood volume and lower blood pressure. There are three main types of natriuretic peptides: atrial natriuretic peptide (ANP), brain natriuretic peptide (BNP), and C-type natriuretic peptide (CNP). ANP is released from the heart's atria, while BNP is produced in the ventricles. These peptides play a crucial role in cardiovascular health and are often measured in clinical settings to assess heart function.