Summary
Summary AQA ALEVEL BIOLOGY NOTES ON ABSORPTION OF GLUCOSE
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ALEVEL NOTES ON THE CELL TRANSPORT TOPIC- ABSORPTION OF GLUCOSE ADJUSTED TO THE AQA SPECIFICATION AND MADE FROM MARKSCHEMES
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Absorption of glucose in the ileum=
How does small intestine increase the rate of movement across membranes ?
ileum micro villi
The epithelial cells lining the
possess
•
.
.
Micro villi provide more surface area for the insertion of
carrier proteins through which diffusion , facilated diffusion
and active transport can take
place .
of and
Increasing the number protein channels carrier proteins
•
in the membrane also increases rate of movement .
what is the role of diffusion in absorption ?
and in diet
When eat
carbohydrates proteins and
digested this would
'
we our are ,
GREATER of and acids
cause a concentration
glucose amino within the ileum than in
the blood .
As cells for &
glucose is used up by higher ileum
.
to ATP it concentration
respiration continuously produce ,
diffusion
helps to maintain the concentration
gradient between the inside of ileum lower 1 /
blood
and the blood .
concentration
•
This increases the rate of movement
diffusion epithelial cell surface membranes
by facilated across
-
.
do need transport absorption if diffusion of it ?
Why we active in takes care
This is because best diffusion results the concentrations either side of the
at
only
•
in
,
diffusion
intestinal epithelium becoming equal .
( does not continue
occurring when
concentrating of both
sides )
are
equal
available and acids in small intestine absorbed
glucose
Not all amino the is
'
-
.
.
i. Active needed to absorb the and
transport is
remaining glucose amino acids .
Terminology
-
Different types of cell membrane transport proteins
substance direction UNRORT ANTIPORT SYMPORT
Uniport
• one one
: ,
=
0 0 0
• Anti port : two substrates , opposite direction 0 7
=
G
direction
•
s#nport : two substrates , same
L d
L O h
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