The Circulatory SystemTransport Absorption Involves the passage of materials into and out of the blood stream. Circulation Distribution of materials through out the body.

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The Circulatory
SystemTransport
Absorption
Involves the
passage of
materials
into and out
of the blood
stream.
Circulation
Distribution
of materials
through out
the body.
Transport
Is the
process of
absorption
and
circulation
of materials
throughout
the body.
The Heart
• The human
heart is a
muscle.
• It has 4
chambers.
• It pumps
blood.
Anatomy of the heart
• The heart has 2 atria
(upper chambers).
• Both atria have very
thin walls used to hold
the blood (waiting
room).
• The heart has 2
ventricles (lower
chambers).
• The ventricles have
very thick walls (blood
is pumped here).
Valves
• The chambers of
the heart are
separated by
valves.
• The valves
prevent the flow
of blood
backwards.
The Pericardium
The heart is covered by
a thin, tough sac
called the
pericardium.
Pulmonary circulation
Involves blood
flow from the
right ventricle
to the lungs
where it picks
up oxygen and
loses carbon
dioxide and
then returns to
the left atrium.
Systemic circulation
• Blood flows
from the left
ventricle to all
body parts
and returns to
the heart.
• This blood
does not flow
through the
lungs.
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