Page 109 - Biology_Form_3

Biology for Secondary Schools

Column A Column B
N. A structure that collects urine from nephrones and
channels it to the pelvis
O. The site of urine concentration in the nephrone
P. An organ that maintains homeostasis by excreting
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nitrogenous waste
Q. A hormone that promotes sodium retention and
potassium excretion
R. The movement of blood under pressure through a
semipermeable membrane
S. A cup-like structure enclosing the glomerulus in
which filtration starts
T. A funnel-shaped structure that connects to the ureter
inside the kidney
Answer the following questions 15. Study the figure of the human kidney

9. Explain the differences between below then answer the questions that
follows
excretion and secretion, providing A
an example for each process. B C

10. Describe the adaptations of the G
nephrone that enable it to efficiently H
perform its function in urine F
formation. E

11. A patient has been diagnosed with
kidney failure and is undergoing D
dialysis. (a) Identify the structures labeled A,
(a) Explain the purpose of dialysis in B, C, D, E, F, G and H.
such a patient. (b) Explain the role of each structure
(b) Suggest two lifestyle changes that labeled A- G.
could help prevent kidney failure. 16. Describe the pathway of blood flow
12. Explain the common disorders of the into and out of the kidney.
urinary system in human. 17. Explain how the liver functions as
13. Describe the mechanism of urine an excretory organ.
formation 18. Explain how sweating helps in the

14. Explain the role of antidiuretic regulation of body temperature and
hormone (ADH) in urine formation excretion.
and describe what happens if there 19. Urinary tract infections (UTIs) are
is an insufficient production of this common disorders of the excretory
hormone. system.

102 Student’s Book - Form Three

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