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8/8/2019 SCI 4 - blood
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BloodBlood
www.geneseelapeer-redcross.org/
8/8/2019 SCI 4 - blood
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FunctionFunction of Bloodof BloodTransports nutrients
Transports gases (oxygen, carbon dioxide)Transports hormones
Defense system
Helps heal body
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TheHeartThe
Heart
http://www.bestanimations.com/Humans/Organs/Organs.html
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TheHeartThe
Heart
Pumps blood to the
lungs
Pumps blood to therest of the body
Cardiac cycle
http://w3.dwm.ks.edu.tw/bio/activelearner/42/images/ch42c3.gif
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Cardiac
Cyc
leCar
diac
Cyc
le
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Veins,
Arteries
an
dCapi
lleries
Veins,
Arteries
an
dCapi
lleries
VeinsVeins carry blood back
to the heart, ie. To the
heart from the lungsand from the rest of
the body
Thin walls, have
valves
http://www.whybevein.com/valve_good.gif
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Veins,
Arteries
an
dCapi
lleries
Veins,
Arteries
an
dCapi
lleries
ArteriesArteries carry blood
away from the heart,
ie. To the lung, and tothe rest of the body
Very elastic
http://www.cardiologiapertutti.org/Immagini/CV%20-%20Aorta%20toracica%20e%20addominale.jpg
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Veins,
Arteries
an
dCapi
lleries
Veins,
Arteries
an
dCapi
lleries
Capilleries
Site of gas exchange
Very thin (1 cell thick)
www.jcu.edu/ biology/RESP1.HTM
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BloodBlood
Blood can be
seperated into solid
and liquid portions-Cells in liquid
4-6 Litres in our body
55%is plasma (liquid)
45% is solids
http://www.pennhealth.com/health_info/bloodless/images/19432.jpg
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Solids
Porti
ons
Solids
Porti
ons
Red blood cells
White blood cells
Platelets
www.colorado.edu/.../ image/figure11c.jpg
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Red Blood
Cells
Red Blood
Cells
5-6 million/mm3
Shaped like a disc or a
donut
Carries oxygen
www.cellsalive.com
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Red Blood
Cells
Red Blood
Cells
Very rich in
hemoglobin
Hemoglobin carriesoxygen
Therefore red blood
cells carry oxygen
www.kacr.or.kr/library/ itemview.asp?no=750&pa...
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White
BloodCe
lls
White
BloodCe
lls
Responsible for
defense
Attack invaders of thebody
Immune response
5,000-10,000/mm3
people.hofstra.edu/.../ engg81/blood.html
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Plate
lets
Plate
lets
No nuclei
Important in blood
clotting
meds.queensu.ca/.../ hemonc/interp/slide37.html
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Hea
ling
Hea
ling
When we break a
vessels, platelets repair
the break
www.astrographics.com/ cgi-bin/ase/ase.cgi?aff
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Cholester
olCh
olester
ol
Too many fatty foods
cause a build up of
cholesterol, plaquein the veins and
arteries
What happens when
cholesterol builds upin our veins and
arteries?http://www.tooelehealth.org/A_Assets/Images/Cardiovascular/Cholesterol/Plaque_In_Arteries.gif
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Heart
attack
Heart
attack
Blockage of an arterie
to the heart
Can be fatal
www.fda.gov/fdac/ features/1999/attack.html
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Str
oke
Str
oke
Lack of blood flow to
the brain
Crippling
www.med.umich.edu/1libr/ aha/aha_stroke_art.htm
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References
References
Campbell, N and Reece, J. 1999. Essential
Biology 5th ed. Toronto, Canada.