Function of the Collecting Duct

Q. Human urine is usually acidic because:

1. Hydrogen ions are actively secreted into the filtrate
2. The sodium transporter exchanges one hydrogen ion for each sodium ion, in peritubular capillaries
3. Excreted plasma proteins are acidic
4. Potassium and sodium exchange generates acidity

Q. acts on venous and arterial smooth muscles, kidneys and the pituitary gland in order to regulate blood pressure.

1. Renin
2. Angiotensinogen
3. Angiotensin I
4. Angiotensin II

Q. Many nephrons supply urine to a single collecting duct.

1. False
2. True