EXCRETORY SYSTEM

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EXCRETORY SYSTEM
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WHAT IS THE EXCRETORY SYSTEM?

• System in the body that collects wastes produced
  by cells and removes the wastes from the body.

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WHAT DOES THE EXCRETORY SYSTEM REMOVE?

• UREA
• Poisonous chemical that comes from the breakdown
  of proteins
• WATER

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EXCRETORY ORGANS

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KIDNEYS

• Act as filters
• Blood flows through kidneys, wastes are removed
  from the blood
• One drop of blood will pass through the kidneys
  300 times a day
• Each kidney contains about 1 million filtering
  factories called nephrons.

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NEPHRONS

• Filtering factories in kidneys
• Removes wastes from blood (urea,water), sends
  needed materials (glucose, water) back to blood

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URINE

• Nephrons form a liquid wasted called URINE.
• Made up of urea, water, and other wastes.
• Bright Yellow? Lots of urea
• Clear ? Lots of water

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URETER

• Urine exits the kidneys and travels through the
  URETER.
• Narrow tubes that connect to the bladder.

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BLADDER

• A saclike muscular organ that stores urine.
• When the bladder is full enough, that is the
  walls are stretched, you feel a need to urinate.
• Bladder hold approx. 2 cups of urine.

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URETHRA

• Small tube connects bladder to the outside of
  body.
• Muscle at the end of the urethra contracts and
  relaxes to remove urine.

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DIALYSIS

• People who do not have functioning kidneys
  undergo dialysis.
• Blood is removed from body, is filtered through a
  machine which cleans the blood.
• It removes wastes and puts needed materials back
  into the blood.
• The blood then enters the body again.

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KIDNEY STONE

• A kidney stone is a solid mass of tiny crystals
  trapped in the kidney or ureter.
• Block urine from passing to bladder.
• Cause swelling and pain in kidneys.
• Can pass if small, may need to be surgically
  removed in too large.

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URINARY TRACT INFECTION (UTI)

• Infection that can happen anywhere along the
  urinary tract.
• Caused by germs, usually bacteria that enter the
  urethra and then the bladder. This can lead to
  infection, most commonly in the bladder itself,
  which can spread to the kidneys.

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