Unit 3 - Organisms exchange substances with their environment
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Summary Gas exchange a level dump
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Unit 3 - Organisms exchange substances with their environment
Institution
AQA
This document isn’t as neat as my notes as it was a dump during my revision period. It does still summarise key points. These techniques 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 th...
Unit 3 - Organisms exchange substances with their environment
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s
exchange
fish humans
9shoppers -
oesophagus
&
·
i
spiracies buccal
7
-
~
N
2
cirsac
[
7 -
i
⑫
①
C-
o 00
Lugy
o
7 I
&
&
o
-
< trachea
cartilage rings
y
·
I ""in
T
trachea - 1I
mouth
T
Ispiral of &
gilamea
&
I
Chitin) opecculum
·
air enters via spericles
,
·
water
flap
goes
in via mouth
Intercostal
·
muscles +
↑ moist Scapiliary
goes down trachea which buccal diaphragm contract
branches into tracheoles cavity floor lowers decreasing the increasing thorasic volume
,
.
pressure, water rushes into decreasing the pressure so
the insect moves , air air the
as rushes into lungs.
·
the mouth
, opecculum closed
sacs are compressed ·
gas exchange in the
pushing ·
gas exchange
e
gill fillaments
,
alveoli
air
throughout the inter cost musc. e
diaphragm
·
system
.
to the opecculum opens + water rushes relax
allowing the air to
ends of the trachele flow out of the
where out of the mouth
gas exchange occurs
.
·
ends have counter-current flow
a small amount
X
-
of water. a
active > water
-
cells
moves into
Cae -
·moreScota
into the
respiring
tissue
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