Atrial Natriuretic Peptide (ANP) is a hormone produced by the heart's atria, specifically in response to increased blood volume and pressure. Its primary function is to help regulate blood pressure and fluid balance in the body. ANP promotes the excretion of sodium and water by the kidneys, which leads to a decrease in blood volume and, consequently, lower blood pressure. In addition to its role in fluid regulation, ANP also inhibits the release of other hormones, such as aldosterone and renin, which are involved in blood pressure control. By counteracting these hormones, ANP helps maintain cardiovascular health and prevent conditions like hypertension.