Excretory System Flashcards
What produces ammonia
Break down of proteins and nucleic acids produces ammonia
What are the functions of the excretory system
To eliminate waste
Collect water and filter body fluids
Remove and concentrate waste products from body fluids
Eliminate excretory products from the the body
Regulate volume and chemical make up of blood.
Is ammonia toxic
Yes
What do mammalian livers do with ammonia
Mammalian livers convert ammonia into uric acid.
By doing so it can excrete it with little water loss
Why do many aquatic organisms excrete ammonia
Because it can be diluted by water
What is the functional unit of the excretory system
The nephron
What are the key functions of the nephron
Filtration
Reobsorption
Secretion
Excretion
What does the Reobsorption do
Good stuff gets out back in blood
What is secretion
Secretion of some water
What is filtration
Filters blood. Bad stuff gets turned into waste
Why do you filter out the good stuff
So it doesn’t end up in urine
What are the different parts of the urinary system
Kidneys
Ureters
Bladder
Urethra
Where are nephrons
In kidneys
What are the 3 parts of the kidneys
Medulla
Cortex
Pelvis
What is the functional unit of the kidney
Nephron
What are the different parts of the nephron
Renal artery Renal vein Bow mans capsule Nephron tubule Glomerulus Proximal convoluted tubule Loop of henle Distal convoluted tubule Collecting duct
About how many nephrons are there
About 1 million
What are the functions of the tubules
Reobsorption of glucose
Reobsorption of salts
Reobsorption of water
Where is the Reobsorption of glucose
Proximal convolted tubule
Where is the Reobsorption of oh salts
PAT AT DCT
How does blood enter the kidneys
Through renal arteries
How does blood leave
Through the renal vein
Where is urine produced
The kidneys
What is urine made of
Excess water and waste products
Where does urine leave the kidneys
Through the ureter
Where does the urine go after the ureter
Urinary bladder
Where does urine go after the urinary bladder
Urethra
How much blood does each kidney process a day
About 1000 litres
