Question

Tubular secretion helps in urine formation due to

• A. The presence of more aldosterone
• B. Lack of aldosterone
• C. Less intake of water
• D. Stones in the kidney

Answer 1

The correct option is A The presence of more aldosterone

Aldosterone is a steroid hormone. It plays a central role in the regulation of blood pressure of the distal tubules and collecting ducts of the nephron, causing increase in reabsorption of sodium ions and water into the blood. Aldosterone stimulates the secretion of potassium ions into lumen of collecting duct. It stimulates secretion of $H^{+}$ ions, regulating plasma bicarbonate $\left(HC{O}_3\right)$ levels and its acid/base balance.