The Excretory System

1
The Excretory System
2
Function of the Excretory System

• To eliminate wastes products from the body

3
Kidneys

• They remove waste products from the blood
• Maintain blood pH
• Regulate the water content of the blood

4

• The ureter carries urine from the kidneys to the
  urinary bladder
• The urinary bladder is a saclike organ where
  urine is stored
• The functional parts of the kidney are called
  nephrons, they filter out impurities from the
  blood

5
Filtration

• Filtration is the process of passing a liquid or
  a gas through a filter
• Filtration mainly takes place in the glomerulus,
  which is a network of capillaries encased in a
  hollow cup called Bowmans capsule

6
Reabsorption

• Reabsorption is when liquid is taken back into a
  vessel
• Amino acids, fats, glucose and water all get
  reabsorbed by the Bowmans capsule into the blood

7
Urine Formation

• Urine contains mainly urea, excess salts and
  water
• The loop of Henle is a section of the nephron
  tubule in which water is conserved and the volume
  of urine is minimized

8
Control of Kidney Function

• The activity of the kidneys is controlled mainly
  by the actual composition of the blood
• Regulatory hormones are released to in response
  to the composition of blood

9
Homeostasis by Machine

• For people who have damaged kidneys, dialysis
  machines can perform many of the functions of the
  kidneys.