Removal of waste and water control

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  • Created by: Hope
  • Created on: 14-04-14 14:40
Why must waste be removed from our body?
In order to stop waste levels becoming toxic
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Why must our water and mineral ion levels be kept constant?
To keep our cells working effectively
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What organs role is it to remove waste and keep water and mineral ion levels constant?
The kidneys
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How and where is urea produced?
In the liver, when excess amino acids are broken down.
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What do the kidneys do to urea?
They remove it from the blood and make urine which is then stored in the bladder
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How do our kidneys maintain our water balance?
Producing urine of different concentrations
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What is an example of homeostasis?
That for our cells to work properly our water and mineral ion content has to be maintain at the correct level
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Define: Homeostatis
Maintaining a constant internal environment
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What is a Kidney Dialysis?
A system for artifically 'cleaning the blood', removing urea and excress ions and water from the blood
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What is a Haemodialysis?
A machine that takes over the function of the kidneys
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How does a Haemodialysis work?
Blood is passed through a system of tubing made of a cellulose like substance that is partially permiable, The tubing is surrounded by dialysis fluid
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What is the main problem with Kidney Transplants?
Rejection
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What are the precautions against rejection in Kidney Transplants?
Tissue Typing- Only giving kidney to patiens who have very similar antigens to donor kidney and Immuno-Suppressent Drugs- supresses immune system from attacking pathogens
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What are the advantages of Kidney Transplants?
Patients can lead a more normal life and cheaper for the NHS
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What are the disadvantages of Kidney Transplants?
Must take immune-supressent drugs, Long wait, Only lasts for a few years
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What are the advantages of Kidney Dialysis?
No shortage, No need for immune-suppressent drugs
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What are the disadvantages of Kidney Dialysis?
Patient must watch what they eat, Expensive for NHS, Big impact on their lifestlye
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How does our body know when it has to maintain a constant temperature?
Temperature receptors in the skin detect changes, Sensory and relay neurons transmit this information to brain.
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What does the body do when the body is too cold?
Blood cells supplying the skin contrict causing less blood to flow nearer the surface of the skin and reduces heat loss. The body shivers which generates heat and they respire more
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What does the body do when the body is too hot?
Blood cells supplying the sin dilate causing more blood to fllow nearer the surface which increases heat loss, The body sweats wihch increases heat loss due to the large amount of heat energy needed to evaporate water
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What is the blood glucose concentration in the body monitored and controlled by?
The pancreas produces insulin which controls the amount of glucose in the blood
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How does the insulin control the amount of glucose in your blood if it is too high?
When there is too much gluocse the insulin 'tells' your liver to store it as glycogen
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What hormone controls the amount of glycose in your blood if it has gone too low? and where is this hormone made?
Glucagon and its made in the pancreas
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How does glucagon maintain the glucose levels in your blood?
It 'tell's' the liver to change glycogen back into glucose
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Other cards in this set

Card 2

Front

Why must our water and mineral ion levels be kept constant?

Back

To keep our cells working effectively

Card 3

Front

What organs role is it to remove waste and keep water and mineral ion levels constant?

Back

Preview of the front of card 3

Card 4

Front

How and where is urea produced?

Back

Preview of the front of card 4

Card 5

Front

What do the kidneys do to urea?

Back

Preview of the front of card 5
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