Download Group 2 PARTS OF HUMAN HEART AND THEIR FUNCTION

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Epicardium
Myocardium
Endocardium
The human heart is four chambered. The upper
chambers are called the atria or the auricles and
the lower two chambers are called the ventricles.
The two atria are separated by the interatrial
septum. The two ventricles are separated from
each other by the interventricular septum. The
ventricles have more muscular walls than the
auricles.
The right side of the heart collects de-oxygenated
blood from the body into the right atria and then
via the right ventricle pumps it into the lungs so
that carbon dioxide can be dropped off and
oxygen picked up.
The left side of the heart collects oxygenated blood
from the lungs into the left atria. From the left
atria the blood moves to the left ventricle which
pumps it out to supply oxygen to the body.
It collects
deoxygenated
blood returning
from the body
(through the vena
cavas) and then
forces it into the
right ventricle
through the
tricuspid valve.
It collects
oxygenated blood
returning from the
lungs and then
forces it into the left
ventricle through
the mitral valve or
bicuspid valve.
It collects
deoxygenated
blood from the
right atrium and
then forces it into
the lungs through
the pulmonary
valve.
It is the largest and
the strongest
chamber in the
heart. It pushes
blood through the
aortic valve and
into the body.
Tricuspid Valves
The right auricle opens
into the lower right
ventricle. This opening
is guarded by
auriculo-ventricular
valve (auriculo
ventricular valve). This
valve is called the
Bicuspid Valves
tricuspid valve as it has
Pulmonary Valves Aorta Valves three flaps.
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 Bicuspid Valves
The left auricle opens into the lower left
ventricle. This opening is guarded by the
bicuspid (having two flaps) or the mitral
valve. The tricuspid and the bicuspid valves
prevent backflow of blood into the auricles
from the ventricles when the latter pump the
blood into the blood vessels.
Pulmonary Arteries
Inferior Vena Cava
Pulmonary Veins
 Aorta
: It is the largest artery and
carries oxygenated blood from the
heart to the rest of the body.
 Superior Vena Cava : Deoxygenated
blood from the upper parts of the body
returns to the heart through the
superior vena cava.
 Inferior Vena Cava : Deoxygenated
blood from the lower parts of the body
returns to the heart through the inferior
vena cava.
 Pulmonary
Veins : They carry
oxygenated blood from the lungs back
to the heart.
 Pulmonary Arteries : They carry
blood from the heart to the lungs to
pick up oxygen.
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