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21 Cards in this Set
- Front
- Back
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Define excretion |
The removal of waste particles of metabolism from living organisms |
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What are humans 3 main excretory organs ? |
LUNGS SKIN KIDNEYS |
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What do the kidneys excrete ? |
Water Urea Excess minerals |
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What is the functional unit of the kidney ? |
Nephron |
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How many nephron are there in a single kidney ? |
Millions |
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What are the nephron’s two jobs ? |
Osmoregulation Excretion |
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What are the 6 main parts of the nephron ? |
The glomerulus Bowman’s capsule Proximal convoluted tubule Loop of henlé Distant convoluted tubule Collecting duct |
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Where does blood enter the kidney from ? |
Afferent artery |
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Is the blood high or low pressure when it enters the glomerulus ? |
High |
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Why ? |
So that all small particles are pushed out of the small holes in the cappilaries wall |
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What happens in the PCT? And what is the process called ? |
Glucose and amino acids are absorbed through selective reabsorption |
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What happens in the loop of henlé ? And what is this process called ? |
Water is absorbed through osmosis |
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What happens in the DCT ? |
Water and minerals are absorbed |
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Where does the remaining fluid go and what does it become ? |
It goes to the collecting duct and becomes urine |
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What is the other job of the kidney ? |
Osmoregulation |
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What sense blood water levels ? |
The Hypothalamus |
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What does the hypothalamus use to control water levels ? |
The pituitary gland |
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What hormone does the pituitary gland release ? |
ADH (anti diuretic hormone) |
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What does ADH do ? |
ADH only causes a response in the collecting duct, the collecting duct becomes more permeable |
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What does this mean ? |
It means that more water is absorbed back into the blood |
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What happens if there is too much water in the blood ? |
The opposite of if there is too little |
