Question

Which of the following substances are secreted by tubular cells into the filtrate during urine formation?

• A. Glucose, aminoacids, $N a^{+}$
• B. $H^{+}, \, K^{+}$ , aminoacids
• C. $N a^{+}, \, H^{+}$ , aminoacids
• D. $K^{+}, \, H^{+}$ , ammonia

Answer 1

Answer: (D)

During urine formation, the tubular cells secrete substances like $H^{+}, \, K^{+}$ and ammonia into the filtrate. Tubular secretion is also an important step in urine formation as it helps in the maintenance of ionic and acid base balance of body fluids.