Glucose,$Na^+$,and amino acids are actively transported substances,because

Which part of the nephron is involved in the active reabsorption of sodium?

Which of the following statements is correct regarding excretion by the human kidney?

The ascending limb of the $Loop$ of $Henle$ is ........

Reabsorption of substances according to the needs of the body is called:

Components reabsorbed by the Proximal Convoluted Tubule $(PCT)$ - $P$
Components secreted by the Proximal Convoluted Tubule $(PCT)$ - $Q$
$I - K^{+}$,$II - \text{Ammonia}$,$III - HCO_{3}^{-}$,$IV - \text{Essential nutrients}$,$V - 70$ to $80\%$ $\text{electrolytes and water}$,$VI - H^{+}$
Select the correct option for $P$ and $Q$.
$P \quad\quad\quad Q$