Unit 3 - Organisms exchange substances with their environment
Summary
Summary Gas exchange a level notes
10 views 0 purchase
Course
Unit 3 - Organisms exchange substances with their environment
Institution
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
All documents for this subject (186)
Seller
Follow
anastazjaohearn
Content preview
Exchange
S Opecun
opening water contains 0 S% .
disolved oxygen at
buccal
30C
, as
you get deeper there is less
[
multicellular organisms need transport systems e
u
cavity photosynthetic plankton which decreases
O conc.
a
diffusion distance to
o o af
exchange surfaces as the
fish extract 80% of avalible Oxygen thanks to
the environment is too larg-
nN
~ S-
A
E
-
counter current flow
S n
W
-
C
an
↳
...
mouth
-
blood water flow in
I
↳-
S
S&S&
GQ
S
-
Air sacs
low
high &G opposite directions
so that max Or can
gill arch
.
diffuse along gill plate along gill plate
To
I⑱ spiracles small pores w gill oesophagus
-
- are
&-...
----- 6 --- , -
E
-
W ...2&
·
1
I
&&"28
S values that control when the tracheal
(
g
&
z
- ,
j
L↳ por
&
y- - - -
S &
I don't
-
be ventilated
6
want to loose OX
system can mouth open, operculum closed
-
-
S -
d
--
· .
-- A
I
↳
=>
too much water) ·
buccal
cavity lowered to
↑ vol.
& -1
-
C& E
Spiracle &
-
-
pores (w values) ·
water rushes dow pressure grad. O O &
mouth closed e floor raised SS
-X
SSCS
⑨
·
%
·I
·
-
water from buccal cavity S
-
·
moves
as the insect moves muscles
,
contract pushing air
over
gills into the opercular
cavity so gifillaments
muse
from the air sacs
through the trache
·
operculum opens , water leaves
5
............
-
-ill > small amount of liquid at the base of tracheoles
I&XI /
-
&"I'll,ll
"
l
to minimise water loss from cells
I'll
IIII
active tissues, water moves into the cells
by
·
> in
-
Osmosis
because it is needed for respiration and water
potential is decreased due to increased lactic acid L
07DaBDOJDDDI07-D E waxy cuticle
WINJTJ]WINJ37338
epiderais
n
> this
-
leads to an increased surface area so that more O2 ↑
-
j-·
Og
z8008 ijpongng
diffuse in and CO2 out
0
can
haemoglobin 0000000
8
D
globular protein %:
e 800
Y
000000 ·
O
00
g
i
·
hydrophyllic chains face outwards so they are soluble of
*
&
·
Ierethrocyte contains 280 million molecules of hemoglobin con 2 0 0 02 0
F
each haem
carry oxygen atoms
2
group can
·
Stomata guard cen
2x units, 2 Bunits
-
·
W
Xerophytes dry conditions.
& qu
live in
body it turgid =
open
Fig
cells have low into cells
gS
partial pressure of On . moves
- - ·
=
& 00 E
&
7 L
↳ folds swell When there is
- S I ⑧ from the mother's haemoglobin rainfall
1 -
-
N
(will take
-
- & '
high
Bohr effect Exercise
S ↳ deep roots
Caturated
= G
C
+
⑨
I
r·
-
Ja
-
affinity
①
Or
#
.
- Stomata can be sat in
-
·
CO2 disolves in blood, acidic ↑ CO2 jj j ↳ thick waxy cuticle
·
lower affinity for O2 #
dips to reduce water loss ↳ trichomes (hairs from epidermis
↓ pH
unloaded easily
· Or
8O
#
low as there is less air moument
SS in
F
>
Shift
& I⑤
-
affinity. O2
resting t.
Right shift curve
·
⑳
#
o
⑧
N
a
active t S-
O2 unloaded G "I
↑
↳
N
S
-
~
-
-------
-
C
f Ja<
· 8
&...........
gogoGG
S
- -
-
O
j
-
>
C
wi
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller anastazjaohearn. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.51. You're not tied to anything after your purchase.
