In which part of the nephron are the majority of electrolytes and water ($70$ to $80\%$) reabsorbed from the glomerular filtrate?

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

The lining of the proximal convoluted tubule $(PCT)$ is made up of $.......$.

Select the $CORRECT$ statements:
$i$. Tubular secretion involves secretion of $H^{+}$ ions in $PCT$.
$ii$. Augmentation involves secretion of $H^{+}$ ions in $DCT$ and $CT$.
$iii$. Augmentation plays an important role in regulation of $pH$ of blood.
$iv$. Glomerular filtrate as well as urine are acidic.

The only mode of excretion in marine bony fishes and desert amphibians is . . . . . . .

In which part of the nephron are all essential nutrients and $70-80 \%$ of electrolytes and water reabsorbed?