Biology presentation

1. Done By: Nazanin, Rachel, Agnes and
Shalini

2. 
Transport
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Water and nutrients from the intestine to the
cells.
Oxygen from the respiratory organ to the
cells and Carbon Dioxide from the cells back
to the respiratory organ.
hormones from endocrine glands.
toxic or waste molecules to the excretory
organ.
Protection
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of the organism from foreign invaders
(immune system)
of itself from loss of blood (clotting
mechanism)
Skeletal, especially in some invertebrates.

4. 
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Works all the time- till you die
Pumps blood through your
circulatory system.
Provides crucial oxygen and
other nutrients to all organs
Double pumps- 1 time to the
body, 1 time to the lungs
Gets blood too- through
coronary system

5. VEIN
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Thick, handles high pressure
of the blood flowing through
the arteries.
From the heart to various
parts of the body.
Arteries carry oxygenated
blood
Arteries are red blood
vessels that carry blood
away from the heart.
resistance vessels
more rigid
Deeper in the body
Aren't present (except for
semi-lunar valves)
ARTERIES
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Thin, prevents the blood
from flowing in the opposite
direction.
From various parts of the
body to the heart.
Veins carry deoxygenated
blood
Veins are darker blood
vessels that carry blood
towards the heart.
capacitance vessels
collapsible
Closer to the skin
Are present, especially in
limbs

7. ARTERY
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Carries pure, filtered and
clean blood away from the
heart, to all the parts of
the body with an
exception of the
pulmonary artery and the
umbilical cord.
As the arteries move away
from the heart, they
divide into smaller
vessels.
Thinner arteries are called
arterioles.
VEIN
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Veins are needed to
carry the deoxygenated
blood back to the heart
for purification.

8. 
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Are very thin and fragile
Only one epithelial cell thick
Blood cells can only pass through them in single file
The exchange of oxygen and carbon dioxide takes place
through the capillary wall.

9. 
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http://www.youtube.com/watch?v=PgI80UeAMo
http://www.youtube.com/watch?v=gn6QmE
TEm8s&feature=endscreen
http://www.youtube.com/watch?v=06iQlVM
SB34
http://www.youtube.com/watch?v=Q530H1
WxtOw

10. DONE BY: NAZANIN, RACHEL, AGNES AND SHALINI