Question 2(b)
[Maximum number: 1]
The urinary system is used in excretion.
The diagram shows the urinary system with parts labelled A, B, C and D.
The urinary system produces urine.
Name a substance found in urine.
IGCSE Biology 2.79B Kidney transplants Topic Practice
2.79B Kidney transplants
Understand that urine contains water, urea and ions.
Question 2(b)(ii)
[Maximum number: 2]
The diagram shows a nephron from a human kidney.
The table gives the mean values of mass filtered per day and excreted per day for different plasma components that are filtered and reabsorbed in the nephron.
Calculate the mean mass of urea excreted per day.
mean mass of urea =
