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Summary - 3.1.2 Transport in Animals

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Provides an in depth, comprehensive and high-yield summary for A - Level biology, specifically tailored to OCR A specification. These notes compile information from the official textbook, mark schemes, and class lectures into a concise revision resource. Includes: Coverage of all points on the specification for 3.1.2 Transport in animals Definitions for key terminology required by examiners Clear, labelled diagrams for complex processes

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small
Transport systems Blood vessels
OPEN SYSTEM M
size t
volume Artery e
away from
heart towards capillary
Imm blood Vein diffusion between
used by insects
of to 13cm
oxygenated heart allow
·




Why are
they needed? ·
medium not always in vessels nigh pressure-thick walls deoxygenated blood bloodt tissues
·SA: V circulates through body cavity thin walls low pressure one cell thick-short diffusion
ratio-larger organisms have a small ·small lumen springs
-
+ -




rely on diffusion dorsal muscular pumping organ ·collagen-strength values preventbackflow
I

Vratio
SA: so can't back
pathway
· -




e
activity - more active:
more
oxygen needed
·


seperate tracheal system for gases ·
elastic tissue -dilation collagen, smooth muscle
very narrow lumen
slow
elasticas smooth
moving due to
for respiration low pressure ·smooth muscle- narrows lumen reduces pressure between
·
size
larger distance for oxygen + nutrients CLOSED SYSTEM for vasoconstriction/vasodilation arteries + veins
travel muscle glattened by
to due to cell
layers medium
stays in vessels endothelium-line lumen-unfold
·



many
·




CIRCULATORY when stretches muscle
surrounding
SYSTEMS ·used
by all vertebrates artery
·have a
liquid transport medium ↳
Sish, birdst
mammals tohelp force
transport double blood along
·have vessels for ~
can be either single or

·have DOUBLE CLOSED L ·narrow lumen
pumping mechanism
I
a


transport gases, waste products + nutrients ·blood passes through heart TWICE
SINGLE CLOSED 2 each circuit
blood travels ·

quick due to
high pressure from heart Tissue fluid
heart - gills-body theart blood pressure to tissues can be high
mainly fish 10 pressure W while pressure to capillaries is low liquid that surrounds cells of tissues
-

transport between blood +
activity of slow reduces
damage cells via
diffusion
low ↳

less neededto blood travels-left of heart - aorta-bodyt forms due to
hydrostatic + osmotic pressure
energy
·




maintain body temp. vena cava - right heart-pulm. artery lungst -> created by
↳ water has constant temp. pulm vein left of heart
-
HYDROSTATIC PRESSURE arteries
OSMOTIC PRESSURE
·blood passes through pulmonary -
deox, to lungs Transport in animals capillaries have a net hydrostatic loss of fluid from hydrostatic
4
heart ONCE
each circuit systematic oxy, -
to tissues pressure of 3.54Pa out pressure causes lower in
Haemoglobin ↳
forces slid out through gaps in capillary -> osmosis occurs
down the
capillary walls and water moves

Electrocardiogram(ECG) TACHYCARDIA biconcave- SA for gas


It
into
exchange ↳ allows movement of dissolved water potential gradient
·




electrodes are placed on the shin
·faster ·small flexible fitin capillaries
-

gases nutrients in the fluid capillaries
over opposite sides of the heart ·ECG looks normal ·


afginity for Oz-can carry 4 each

CIt
-




I
but with short interval WET MOVEMENT ·
the electrical potentials generated oxygenated oxyhaemoglobin =
-
lower Y
recorded with time of excitation nucleus more space for gases ·24Pa out

0.5
are

wave ·no
e
-


I


Butthat hydrostate
4
NORMAL Pwave-atrial systole made of 4 globular proteins with capillary
gld
I




out
hydrostatic. Varies from 1.5
higher
QRS complex-ventricular. bound from -> pressure
arterial to venous
R l an iron ion permanently forces
&
hPa from tissues hPa



-
T
sino-atrial node not force fluid
CURVE



emba"now in
systole
·

DISSOCIATION end -
P
working O2 attaches,
back in
↳ -

~> insufficient
Twave
recovery of ·one
-




attache
Q
ventricular walls (ventricular causes tiredness blood
S conformational change
repolarisation) ·pacemaker fitted ograhing allows PREGNANCY
for easier attachment




/rawsao
heartbeat
>Q-T interval contraction ·hard
for 4th to attach ·foetal haemoglobin
e
2



-




T-p-time for time of ventricles
·artig' due to Hb being saturated has stronger agginity LYMPH

-
-




I 6
ventricles to relax +fill pres ·notdirectly proportional contains
↳ to the LEFT
of lymphocytes
.
an
↳ measure of
ATRIAL FIBRILATION higher pOz needed 100% saturation is adultcurve that made in the

-
Oz concentration
a as are

·small/unclear P competition difficult
becomesmoresatural lymph
wave to saturate Mb -
low pOz high pOz e nodes
e.g. W eins eg. lungs
hydrogen ·ly mph passes through

~
ions
atria not contracting properly from
·




BOHR EFFECT CO, TRANSPORT MYOGLOBIN




a n
blood flowing through the heart the lymphatic system +
-
-> less -




Doesm i r o r contamin
② carbonic
VENTRICULAR FIBRILATION ·high CO2 environ -
o 5% dissolved in
higher assinity man back into the circulatory
pattern ment blood plasma haemoglobin moves LEFT system
·

more
no oxygen
-
-




often caused by heart dissociates from ·100% carbomino ·underwater mammals have
e naemoglobin tissue a lymph
a as -

weeken
(1)
attach-ventricles flutter oxyhaemoglobin oxyhaem.
more
myoglobin plasma ->
->


hold breath for longer fluid
no circulation unconscious
-heartbypass dissociation 85% as
hydrogen ↳ in blood
·
can
-

oxygen
·

desib. needed and root prob↳em treated curveshifts RIGHT ↳

oxygen is
released Blood carbonate ions I

Plasma

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August 9, 2026
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Type
Summary
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