Question

Human urine is usually acidic because

• A. Sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries
• B. Excreted plasma proteins are acidic
• C. Potassium and sodium exchange generates acidity
• D. Hydrogen ions are actively secreted into the filtrate

Answer 1

Answer: (D)

Hydrogen ions are actively secreted into the filtrate

An adult human excretes, on an average, 1 to 1.5 liters of urine per day. The urine formed is a light yellow colored watery fluid which is slightly acidic (pH-6.0). The Human urine is usually acidic because hydrogen ions are actively secreted into the filtrate.

So, the correct answer is 'Hydrogen ions are actively secreted into the filtrate'.