Excretory System

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Excretory System
Removes wastes from the body.
Excretion The process of removing wastes and
excess products from the body.
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Three systems are involved in excretion

• Respiratory Lungs remove carbon dioxide.
• Integumentary Skin removes waste and water when
  you sweat.
• Urinary Kidneys remove wastes from blood.

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Urinary System
Removes waste products from the blood.
Urinary system is made up of

• Kidneys
• Ureter
• Bladder
• Urethra

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Kidneys

• Two kidneys constantly clean the blood
• Nephrons are found inside the kidneys.
• Nephrons are filters that remove harmful
  substances from the body.
• Urea is one of the most important wastes removed
  from the body.
• Urea is produced when proteins are used for
  energy.

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How Kidneys Filter Blood

• Blood is brought to each kidney by an artery.
• Smaller blood vessels take blood to nephrons.
• Water and other substances are forced out of
  blood vessels and into the nephrons.
• Most of the water and some nutrients are
  returned to the blood vessels after traveling
  through the nephrons.
• The cleaned blood leaves each kidney through a
  vein.

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Waste Removal

• A concentrated mixture of waste materials,
  urine, is left behind in the nephrons.
• The urine leaves each kidney through a slender
  tube, ureter, that takes it to the urinary
  bladder.
• Urine is stored in the urinary bladder.
• Urine leaves the body through another tube
  called the urethra.
• Urination is the process of expelling (removing)
  urine from the body.

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Artery
Vein
Kidney
Ureter
Bladder
Muscle
Urethra
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