Kidneys - Kidney in Detail Standard Grade Biology Excretion...

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Kidney in Detail Standard Grade Biology
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Excretion by the Kidney Urea -nitrogenous waste -made by liver -excess amino acids in blood -toxic Why must nitrogenous waste be excreted?
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1 – Filtration by the Kidney Renal artery Ureter Renal vein •Supplied with blood from renal artery •Inside it splits into many fine capillaries •Each capillary supplies blood to hundreds of thousands of tiny filtration units called nephrons Lets have a look at a nephron!!!
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1. Glomerulus brings a large surface area of blood capillaries in close contact with Bowman’s capsule 2. Liquid filtered from blood under pressure ( filtration) 1. Glomerular filtrate produced containing: -water -glucose -salts -urea (Protein molecules and red blood cells do not pass into tubule as they are TOO BIG!!!!) Blood from renal artery enters wide capillary Blood travels through narrow capillary towards rena vein Glomerular filtrate Filtration
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Think… Which feature of the glomerulus helps the process of filtration? Which 4 components of unfiltered blood
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Kidneys - Kidney in Detail Standard Grade Biology Excretion...

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