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Biology
Blood Vessels
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Created by
Emmanuella Osebre-Osei
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Cards (6)
The heart acts as the
pump
for the
circulatory
system
Blood vessels
1.
Arteries
carry blood
away
from the heart
2. Capillaries exchange
nutrients
and
oxygen
with tissues
3.
Veins
carry blood back to the
heart
Arteries
Carry
blood
directly from the heart
Blood inside is at
high
pressures
Have thick layers of muscle and
elastic
tissue to be strong and
elastic
Capillaries
Very
small
vessels that come into close contact with cells
Walls are only
one cell thick
and
permeable
Total cross-sectional area is much higher than
arteries
, so blood flows more
slowly
Veins
Relatively
large
with biggest
lumen
Walls are
thin
with small layers of
elastic
and muscle
Have
valves
to prevent
backwards
blood flow
Calculating rate of blood flow
Divide
volume of
blood
by time taken