Homeostasis and the Kidneys B3

  • Recap on general Homeostasis
  • Urinary system diagram
  • Kidney cross-section
  • Nephrons and ultrafiltration
  • Kidney transplants and Dialysis

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Homeostasis: A quick recap
Homeostasis is processes that help your body to maintain a constant internal environment.
There are 6 main things that need to be kept at a constant level in the body. These are...
CO - A waste product of respiration.
Urea ­ Waste formed in the liver by the breaking down of amino acids. A metabolic
These are all regulated in some way by the body.
The Lungs remove CO
The kidneys remove excess water, ions and urea
The skin and muscles adjust body temperature
The liver and pancreas work together to maintain blood sugar levels
You'll need to know the names of the organs in the urinary system.

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You will also have to be able to label a cross- section of the kidney, and give the position of
the nephrons.
The kidneys act as "filters" in the body, removing urea, ions and excess water from the
blood. They do this via a process called Ultrafiltration.
In the kidney there are thousands of tiny structures called Nephrons. It is here that
Ultrafiltration happens.…read more

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Kidney problems can be caused by a number of things, such as disease, diabetes or infection.
There are two main methods of treatment. These are dialysis and transplantation. You need
to know some of the advantages and disadvantages of each one.
Transplantation involves replacing the kidney, and is good because the person can resume a
farily normal life afterwards, although sometimes immuno-suppresive drugs must be taken.…read more

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There are many disadvantages of relying on dialysis.
The patient has to follow a specific diet, in order to avoid complications.
They are expensive.
The patient must be connected to the machine for several hours a week. This means
they can't live a normal life- working hours etc are affected.
They only work on a patient for a limited time.…read more


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