B3 - Kidneys

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What is the kidneys three main functions?
-Removes urea from the blood -Adjusts iron levels in the blood -Adjusts water content of the blood
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What does ultrafiltration do?
High pressure is built up and squeezes water, urea, ions and glucose out the blood and into the bowmans capsule
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What do the glomerulus and bowmans capsule act as?
Filters which leave big molecules such as protein in the blood
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What happens in reabsorbtion?
Glucose is selectively reabsorbed, useful substances are reabsorbed and water is reabsorbed depending on the level of ADH
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What happens in release of waster?
Urea and excess water continue out the nephron, to the bladder as urine and are later released
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What does ADH stand for?
Anti diuretic hormone
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How is ADH levels controlled?
The brain monitors the water content in the blood and instructs the pituitary gland to release ADH
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What happens if water concentration of the blood rises?
Less ADH is released, meaning the kidney reabsorbs less water
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What happens if water concentration of the blood falls?
More ADH is released, meaning the kidney reabsorbs more water
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What system does ADH use?
Negative feedback
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How can you prevent the likelihood of a donor kidney being rejected?
-A donor with a closely matching tissue type to the patient is chosen -The patient is given drugs that suppress the immune system so it won't attack the kidney
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Why are dialysis machines used?
To help people with kidney failure to filter blood properly
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How does a dialysis machine work?
The patients blood is passed through the machine and cleaned of any waste products the kidney would usually remove
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What are the disadvantages of dialysis?
-Only work for a limited time -Must be done regularly for long amounts of time each week -Patients must follow a strict diet to avoid problems -They are expensive
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Other cards in this set

Card 2

Front

What does ultrafiltration do?

Back

High pressure is built up and squeezes water, urea, ions and glucose out the blood and into the bowmans capsule

Card 3

Front

What do the glomerulus and bowmans capsule act as?

Back

Preview of the front of card 3

Card 4

Front

What happens in reabsorbtion?

Back

Preview of the front of card 4

Card 5

Front

What happens in release of waster?

Back

Preview of the front of card 5
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