Final answer:
ANH (Atrial Natriuretic Hormone) assists in the regulation of urine volume by causing the loss of sodium and water from the kidneys, leading to increased urine volume and decreased blood pressure.
Step-by-step explanation:
True. Atrial Natriuretic Hormone (ANH), also known as atrial natriuretic peptide, plays a crucial role in the regulation of urine volume. ANH is secreted by cardiomyocytes in the atria of the heart when blood volume, and subsequently blood pressure, is high. This secretion is a response to the stretching of the atrial walls. ANH functions as an antagonist to aldosterone, promoting the loss of sodium and water from the kidneys, which leads to an increase in urine volume.
By inhibiting the reabsorption of Na+ in the distal convoluted tubule (DCT) and collecting ducts, ANH causes more Na+ to be excreted, and water follows due to osmotic forces. Consequently, this mechanism leads to decreased blood volume and lower blood pressure, highlighting the role of ANH in the control of urine volume.