Unit 3 - Organisms exchange substances with their environment
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Digestion a level summary notes
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Unit 3 - Organisms exchange substances with their environment
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AQA
These notes helped me get into medical school, I completed my a levels at Guildford high school which consistently ranks among the top schools in the UK and is known for their academic rigour. I made these notes as a summary of the power points that we were taught off of.
Unit 3 - Organisms exchange substances with their environment
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Digestion Bile
↳ neutralises stomach acid
↳ aids in emulsification
Lipids
carbohydrates ·
bile salts
emulsify fat droplets.: 4 SA
·
salivary amylase breaks starch into maltose
·
micelles are lipid + bile salt molecules that are
constantly
·
amylase secreted
by pancreas in pancreatic juice which breaking reforming
*
acts on
remaining starch in the duodenum ·
fatty acids (nonpolar) , diffuse
maltase
maltose >
2x-glucose falty globules combine with proteins to form chilomicrons
sucrase
,
sucrose fructose ex glucose in the Golgi
lactase
lactose >
galactose - a
glucose Chilomicrons are exocytosed and enter the lacteal
where it is transported away from the intestine
protein
·
the endopeptidase pepsin hydrolyses peptide : ~ Chilomicrons
bonds within the protein in the stomach Micellesii ↳
synthesised at Smooth ER
mour
·
pancreatic juices contain endo-e exopeptidases
↳ processed apparatus
in
golgi
↳
exopep
polypeptide dipeptide + long polypeptide
-
triglycerides
In the cell membrane there are dipeptidases
⑮
·
·
proteins
dipeptide dipeptidase , 2 amino acids
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