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nat 5 biology
2.7 absorption of materials
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Cards (17)
oxygen
and
nutrients
from food must be
absorbed into
bloodstream
to be delivered to cells for
respiration
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capillary
networks
allows
exchange
of materials at a cellular level in
tissues
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efficient features, surfaces in the body have, if involved with lots of
exchange
good
blood
supply to maintain a
steep
diffusion gradient,
large
surface areas to
maximise
rate of diffusion,
thin
walls to
minimise
diffusion distance
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gas
exchange
occurs in
alveoli
in
lungs
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gases are
exchanged
from
blood capillaries
surrounding
alveoli
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lungs
exchange
organs (
O2
+
CO2
are exchanged here)
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alveoli
tiny
air sacs
which provide
large
surface area
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small
intestine
location of absorption of
nutrients
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villi
millions of
thin
walled, large
surface area
, good blood
supply
, finger-like projections in the
inner
walls of small
intestine
that absorb
nutrients
from food
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water soluble food products
glucose
+
amino acids
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water
soluble food products absorbed into
blood
capillary
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fat soluble food products
fatty acids
+
glycerol
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fat
soluble food products absorbed into
central
lacteal
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digestion
breakdown of large food
molecules
to small
soluble
molecules
with
enzymes
, absorbed across lining of small
intestine
into
blood
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starch
->
maltose
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protein
->
amino acid
s
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fat
->
fatty acids
+
glycerol
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