The efferent arteriole emerging from the glomerulus forms a fine capillary network around the renal tubule, which is called .......

The portion of the nephron which is relatively impermeable to water is:

Components reabsorbed by passive transport - $P$
Components reabsorbed by active transport - $Q$
$I - Na^+$,$II$ - Glucose,$III$ - Nitrogenous wastes,$IV$ - Amino acids,$V$ - Water
Select the correct option for $P$ and $Q$.
$P \quad \quad Q$

Glucose is mainly absorbed in

The collecting tubules lead into ducts called

Under normal conditions,which substance is completely reabsorbed in the renal tubules?