True. Atrial natriuretic peptide (ANP) is a peptide hormone synthesized and stored in specialized cardiac muscle cells, primarily in the atria of the heart. It is released in response to stretching of the atrial walls, which occurs when blood volume and pressure are elevated. ANP acts as a potent counter-regulatory hormone to the Renin-Angiotensin-Aldosterone System (RAAS). Its primary functions are to reduce blood volume and pressure by promoting the excretion of sodium (natriuresis) and water (diuresis) by the kidneys. It also causes vasodilation (widening of blood vessels) and inhibits the release of renin, aldosterone, and vasopressin (ADH). Together, these actions effectively lower blood pressure, making ANP a crucial hormone in the body's short-term and long-term regulation of blood pressure and fluid balance.

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