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1740769
The Excretory System: From Your Heart to the Toilet
Description
Mind Map created when watching Crash Course Biology on youtube.
No tags specified
biology
higher biology
crash course biology
urinary system
excretory system
hank green
vlogbrothers
kidney
nephron
urine
biology
crash course
higher
Mind Map by
blythe315
, updated more than 1 year ago
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Created by
blythe315
almost 10 years ago
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Resource summary
The Excretory System: From Your Heart to the Toilet
Homeostasis: Regulation of a stable internal enviroment no matter where we are or what we are doing.
Kidneys
Maintain levels of water and dissolved materials
Control blood pressure
Filter 180 litres of fluid but only 1.5 litres is peed out
Renal Arteries: Blood enters kidneys from heart
Urethra
Empties urine outside
Bladder
Stores water
Ureter
Tubes in which urine flows from kidney to bladder
Osmoregulation: Maintaining the right level of water and absobed substances.
Ammonia: toxic. Converted into urea or uric acid
Urea: Combined ammonia and Co2 in liver.
Advantage: Very low toxicity
Extra water must be available to dissolve and get rid of it.
Uric Acid: Paste, not a lot of water needed
Nephrons
Tiny filtering structures
About a million in each kidney
!. Glomerulus: Porous capillaries. Starting point. High pressure squeezes out filatre
Filtrate: water, urea and smaller ions and molecules
2. Bowman's Capsule
3. First Tubule:. Osmoregulation takes place. Reabsorb water and materials.
4. Loop of Henle: Reabsorption. Three jobs.
1. Extracts most of the water that we need from the filtrate.
2. Pumps out the salts that we want to keep
3. Makes medula hypertonic
Membrane highly permeable to water
5. Second tube. Regulates levels of potassium, sodium and calcuim
6. Collecting tubes: Channel excess water, urea and other metabolic waste back to the center of the kidney.
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