The excretory system removes waste from the body through excretion. The kidneys are key excretory organs that filter waste like carbon dioxide, water, and nitrogenous waste from the blood to produce urine. The urine passes from the kidneys through ureters to the urinary bladder, where it is temporarily stored before leaving the body through the urethra. The nephrons are the functional units of the kidneys that filter the blood and produce urine, consisting of a glomerulus surrounded by Bowman's capsule and tubules.

1. EXCRETORY SYSTEM

3. The job of the excretory
system is to remove
various wastes
produced by the body.
The removal process is
known as excretion.

4. The wastes produced by
the body :
- Carbon dioxide
- Water
- Nitrogenous wastes
- Mineral Salts:
(NaCl , KSO4)

5. Ammonia Urea Uric Acid

6. Functions of Excretion
1. To Regulate the chemical
makeup of the blood and
body fluids by removing
wastes and excess materials.
2. To maintain a constant body
temperature by removing
excess heat.

7. 3. To maintain the
homeostasis (internal
balance) together with
the circulatory, nervous
and endocrine system

8. Human Urinary System
The urinary system includes
the
- Kidneys,
- Ureter,
- Urinary bladder,
- Urethra.

10. Functions of Kidneys
•They remove the wastes of
cellular metabolism from the
blood.
•They control the
concentrations of the various
substances found in the body
fluids.

11. The kidneys filter
metabolic wastes and
various other
substances from the
blood, producing urine.

13. Two tubes, the
ureters, carry the
urine to the urinary
bladder, where it is
stored temporarily.

14. Another tube, the
urethra, carries the
urine from the
bladder to the
outside of the body.

16. Structure of Kidney
The kidney is divided into three
distinct regions.
•The outermost region is the
cortex,
•the middle region is the
medulla, and
•the inner region is the pelvis.

18. The filtering of the blood
occurs in the cortex;
The medulla consists of
collecting ducts that carry the
urine; and
The pelvis is a cavity
connected to the ureter, into
which the urine drains

20. Structure of Nephron
•The functional units of the
kidneys are the nephrons.
•A cluster of Blood capillaries,
the glomerulus,
•It is surrounded by
Bowman's capsule.

21. Four functions of the kidney

22. - proximal
convoluted tubule
- loop of Henle
- distal convoluted
tubule
- collecting duct

24. A Nephron

26. Blood enters the kidneys
through the renal
arteries.
It leaves the kidneys
through the renal veins.

32. MEIOSIS

49. QUIZ

50. 1.What is the job of
excretory system?

51. 2.What are the
functions of
excretory system?

52. 3. What are the
metabolic
wastes?

53. 4. What are the
excretory organs
in human body?

54. 5. List the parts of
human urinary
system?

55. 6. List the three
parts of kidneys

56. 7.Which part of
kidney is the
functional unit

57. 8. Describe the
structure of a
nephron

58. Cytokinesis

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