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Transcript
Blood Flow
Heart  Lungs 
Heart  Body
Vena Cava vein
AORTA artery
Atria
Ventricles
UNoxygenated
blood enters the
atrium on the right
side of the heart.
Unoxygenated
blood comes in
from the top of the
body through the
superior vena
cava.
Unoxygenated
blood comes in
from the lower
body though the
inferior vena cava.
While the
unoxygenated
blood is in the
right atrium,
the tricuspid
valve is closed
to keep the
blood from
flowing down
to the
ventricle.
The
atrium
contracts
and the
tricuspid
valve
opens,
forcing
the blood
down into
the
ventricle.
The tricuspid
valve closes
again so that
blood cannot
move back up
into the atrium.
The ventricle
contracts.
This forces
the
unoxygenated
blood through
the
pulmonary
valve and into
the
pulmonary
arteries.
The right pulmonary
artery takes the
unoxygenated blood
to the right lung.
The left pulmonary
artery takes the
unoxygenated blood
to the left lung.
THE PULMONARY
ARTERIES ARE THE
ONLY ARTERIES
THAT CARRY
UNOXYGENEATED
BLOOD.
In the lungs,
the carbon
dioxide in the
blood
diffuses into
the alveoli.
The oxygen
in the lungs
diffuses into
the blood.
This is
called gas
exchange.
http://www.webmd.com/hw/health_guide_atoz/tp10237.asp
Oxygenated
blood from the
lungs enters the
heart through
the left atrium.
The mitral valve
is closed to keep
the blood from
going into the
ventricle.
Oxygenated blood
from the right lung
returns to the heart
through the right
pulmonary vein.
Oxygenated blood
from the left lung
returns to the heart
through the left
pulmonary vein.
THE PULMONARY
VEINS ARE THE
ONLY VEINS THAT
CARRY
OXYGENATED
BLOOD.
The left atrium
contracts.
This forces
the
oxygenated
blood through
the mitral
valve into the
right ventricle.
The mitral
valve closes
again. This
keeps the
oxygenated
blood from
moving back
up into the
atrium.
Oxygenated
blood is forced
into the aorta
to be carried
to the rest of
the body.
Oxygenated
blood is carried
to all body cells
where oxygen
diffuses into the
cells and carbon
dioxide diffuses
into the blood.
Blood carrying
carbon dioxide
then returns to
the heart.
And the
cycle
begins
again.
Meanwhile…
While the blood is
moving oxygen and
carbon dioxide
around, it is also
moving nutrients,
other wastes,
hormones, and
antibodies at the
same time.