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Summary IB Biology 6.2 Notes (Blood System)

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Detailed notes on topic 6.2 of the IB Bio syllabus summarising everything from different blood vessels to each step of the cardiac cycle, including a labelled graph to demonstrate pressure changes.

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THE
FBI ④ ④ ☒ BLOOD PLASMA :


pale yellow
watery liquid
I $ LENK





-
.
making up 50% -60% of
the blood volume

red blood cells
Erythrocytes =



Leukocytes = White blood cells
platelets = cell fragments (for blood cloning)
materials transported in blood:
Nutrients amino acids, vitamins,
glucose
:
,
minerals (carried in plasma )
oxygen : carried in haemoglobin by RBCs
CO2 carried plasma RBCs from
respiring
: in ✗

tissues
carried
urea : in plasma to
kidneys
Hormones :
transported in plasma
Antibodies : proteins ) produced by
lymphocytes
C
✗ carried in plasma
Heat : distributed from warm to cool areas

Arteries : carry blood
away from the
=
heart
thick, walls to withstand high
strong
-




pressure

strength comes from fibres present
collagen
in smooth muscle which contract at
,

heartbeat to maintain blood pressure
every
and
keep the blood
flowing

, Veins :
carry blood# the heart


thin walls because the blood is at a
lower pressure
to reduce friction of
larger lumen
-




blood cells and tunica intima
G valves prevent backflow

fine network
CAPILLARIES: between veins ✗
arteries
consists of
permeable
.




selectively
endothelium
G blood
only walls allow exchange
bring
=
of materials between
to cells cells in the tissues of
blood


to
THE to body


s
semilunar
Pulmonary
HEART y
: aorta
valves
artery




÷÷o¥÷É÷ f¥
-
vena pulmonary
cava
← vein

:
body




n¥¥¥µ¥vit
lungs


tricuspid valve

Document information

School year
5
Uploaded on
May 24, 2021
Number of pages
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Written in
2020/2021
Type
Summary
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