Kidney in Detail. Standard Grade Biology. Excretion by the Kidney. Urea -nitrogenous waste -made by liver -excess amino acids in blood -toxic Why must nitrogenous waste be excreted?. 1 – Filtration by the Kidney. Supplied with blood from renal artery
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Standard Grade Biology
-made by liver
-excess amino acids in blood
Lets have a look at a nephron!!!
2. Liquid filtered from blood under pressure (filtration)
(Protein molecules and red blood
cells do not pass into tubule as
they are TOO BIG!!!!)
Blood travels through narrow capillary towards renal vein
Nephron: structure in the kidney that acts as a microscopic filtration unit
Glomerulus: dense mass of very fine blood capillaries at the nephron that act as a filter
Bowman’s capusle: cup-shaped part of the nephron that holds a glomerulus and collects the products of filtration from it
Glomerular filtrate: liquid removed from the blood by filtration in the kidney
-they are no longer in bloodstream
Final urine containing:
Variable amounts of water and salts reabsorbed and filtrate gradually turning into urine
-important part of internal environment
-constantly changing water concentration
drinking lots of water
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