1. Human Excretory
urinary System
The kidney- grade 11

2. Structure of the urinary excretory
system

3. This system includes 4 main organs:
Kidneys
Bladder
Excretory
system
Urethra
ureters

4. Main function of the urinary System
 The
human excretory system functions to
remove waste from the human body.
 During
urination animals get rid of
nitrogenous waste products of metabolism,
including ammonia, urea, and uric acid.

5. The internal & external structures of a
kidney

6. The flow of urine inside the kidney
Glomerulus
Renal
tubules
Renal
pelvis
Ureter
Renal
calices

7. Purpose of a kidney
 Filters
blood, redirecting wastes as urine
through the ureter and to the urinary
bladder and out of the body via urethra.
 Each
kidney consists of millions of nephrons
– the fundamental units of the kidney

8. Structure of a nephron

9. What is a nephron?
A functional
unit of a
kidney.
Blood enters
the nephron at
the Bowman’s
capsule and is
filtered by the
glomerulus, a
ball of
capillaries.
Bowman’s
capsule
collects
filtrate,
plasma forced
out of the
blood.
Filtrate passes
through the
entire nephron
becoming
modified into
urine.

10. Blood Flow through the Kidneys
Blood enters
via renal
artery
Arterioles
Nephron
Renal
corpuscle

11. The 3 processes of blood purification
inside the kidneys.

14. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Bowman's
capsule
Glomerulus
Filtration
Reabsorption to blood
Secretion from
blood
Renal tubule
Excretion

15. The remaining urine goes to the collecting
duct and into the ureters, the bladder and
out of the body via the urethra.

16. Normal & abnormal flow of urine

17. References
The slides above have been re-purposed from the following
presentation links from slideshare:
http://www.slideshare.net/itutor/excretory-system23183659?qid=6d3c0d3b-e56c-4c57-83c098fbae82b3eb&v=qf1&b=&from_search=1
http://www.slideshare.net/jgthatsme/excretorysystem?qid=9ee1584a-3dda-4d5a-b11be75b5400133f&v=qf1&b=&from_search=1
http://www.slideshare.net/132cool/excretory-system8430788?qid=81f3882c-84d0-46f6-867b782728c2fc79&v=default&b=&from_search=12

18. 201125991
Ledwaba .M