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 |
Removal of the proximal convoluted tubule from the nephron will result in:
Which one of the following statement with regards to the excretion by the human kidneys is correct?
1. | Descending limb of Loop of Henle is impermeable to water |
2. | Distal convoluted tubule is incapable of reabsorbing HCO3 |
3. | Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules |
4. | Ascending limb of Loop of Henle is impermeable to electrolytes |