Which one of the following is likely to accumulate in a dangerous proportion in the blood of a person whose kidney is not working properly?

Acute renal failure $(ARF)$ is characterised by . . . . . . .
$i$. Irreversible increase in glomerular filtration rate.
$ii$. Frequent elimination of large quantities of urine.
$iii$. Sudden worsening of renal function.
$iv$. Elevated serum creatinine levels.
Select the correct option given below.

The presence of $RBC$ in the urine is called ........

Ketonuria is defined as the presence of ........ in the urine.

Explain,why is a haemodialysing unit called an artificial kidney?

Which of the following is correct with reference to haemodialysis?