Which process is associated with urine formation in the excretory unit?

Which of the following amino acids is present in the ornithine cycle?

The first step in the urine formation is the filtration of the blood,which is carried by the ...$A$... and is called ...$B$.... On an average ...$C$... $mL$ of blood is filtered by the kidneys per minute,which constitutes ...$D$... of the blood pumped out by each ventricle of the heart in a minute. Choose the correct options for the blanks $A$ to $D$ to complete the given $NCERT$ statement.

Urine formation in the kidney involves which of the following processes in the correct order?

What is the composition of the filtrate present in the lumen of Bowman's capsule?

Assertion : The amount of the filtrate formed by the kidneys per minute is called $\text{GFR}$.
Reason : $\text{GFR}$ in a healthy individual is approximately $25\ ml/\text{minute}$.