define excretion the removal of metabolic waste from the body
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F214 REVISION- EXCRETION
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Define Excretion
The removal of metabolic waste from the body.
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Name the main 2 substances excreted by the body Carbon dioxide from respiration
Nitrogen-containing compounds such as urea
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Complete the following sentences: Carbon dioxide combines with water
in the blood to form Carbonic acid
This dissociates to form hydrogencarbonate ions and Hydrogen ions
This occurs under the influence of the enzyme carbonic anhydrase
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Label the following
Hepatic VeinHepatic Portal Vein
Hepatic Artery
Bile Duct
Sinusoid
Kupffer Cell
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What is the role of the Kupffer cells Kupffer cells are specialised
macrophages. They move within the sinusoids and are involved in the breakdown and recycling of old red blood cells
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Name 3 functions of the liver
Control of blood glucose levels, amino acid levels, lipid levels
Synthesis of red blood cells in the fetus, bile, plasma proteins, cholesterol
Storage of vitamins A, D and B12, Iron, glycogen
Breakdown of hormones Destruction of red blood cells
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Outline what happens during deamination Reacts with oxygen
Produces Ammonia and Keto acid
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Have a go at the following past exam question
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Fill in the gaps
Alcohol is broken down by hepatocytes by the action of the enzyme ethanol dehydrogenase. This produces ethanal which is dehydrogenated further by the enzyme ethanal dehydrogenase. The final compound is ethanoate which combines with coenzyme A to form acetyl coenzyme A. The hydrogen ions produced in this process combine with NAD to produce reduced NAD.
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Label the following
Efferent Arteriole
Renal Vein
Glomerulus
Afferent arteriole
Loop of Henle
Proximal Convoluted tubule
Bowman’s Capsule
Collecting Duct
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Where is most of the water reabsorbed?
a) Proximal Convoluted tubule
b) Loop of Henle
c) Distal Convoluted tubule
d) Collecting duct.
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Past exam question
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Why does the water potential decrease as you go down the descending limb? Loss of water by osmosis to
surrounding tissue Diffusion of sodium and chloride ions
into the tubule
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State 3 sources where water is gained Food
Drink
Metabolism
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Fill in the boxes for the following flow diagram:
Increase in water potential
Decrease in water potential
Detected by osmoreceptors in hypothalamus
Detected by osmoreceptors in hypothalamus
Less ADH produced
Collecting duct wall less permeable
Less water reabsorbed
More ADHproduced
Collecting duct wall more permeable
More water reabsorbed
Decrease in water potential
Increase in water potential
Normal Water potential in blood
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Explain how kidney Dialysis works Removes wastes, excess fluid and
salt from the blood Dialysis membrane is partially
permeable The dialysis fluid contains the correct
concentration of salts, urea, water and other substances in blood plasma
Any substance in excess diffuses across
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