Brush-bordered epithelium (microvilli-bearing) is found in:

The proximal convoluted tubule has a brush border which is due to

The $Duct$ of $Bellini$ is concerned with

Glucose is reabsorbed from the glomerular filtrate by ......... .

The following figure shows the reabsorption and secretion of major substances in different parts of the nephron. What do $P$,$Q$,and $R$ represent?
$P \quad\quad Q \quad\quad R$

Removal of proximal convoluted tubule $(PCT)$ from the nephron will result in: