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THE HUMAN HEART
A JOURNEY THROUGH THE
HUMAN HEART
Presentation by Samantha Cameron
TABLE OF CONTENTS
The heart itself
Heart rate
Heart valves
Sounds of the heart
Heart at work
Listen to your heart
The heart to the lungs
Techno tools
The heart to the body
Heart health
Guarding your heart
Credits
THE HEART ITSELF
The human heart
consists of 4 chambers
there are two types of
chambers: the atrium
and the ventricle
there are two of each
type in the heart
the heart weighs a
mere 300 grams
HEART VALVES
The human heart contains valves which
prevent blood from flowing back into the
heart chambers after it has contracted
atrioventricular valves are found between
the atrium and ventricle of each side of the
heart
semilunar valves are found in the arteries
leaving the heart to prevent blood from
flowing back into the ventricles
HEART AT WORK
Each minute of the
day the heart pumps 5
litres of blood
each time the heart
beats it sends
deoxygenated blood to
the lungs and
oxygenated blood to
the body
THE HEART TO THE LUNGS
Blood enters the right
atrium of the heart via
two large veins: the
superior vena cava and
the inferior vena cava
blood exits the right
ventricle of the heart
through the pulmonary
artery to the lungs
THE HEART TO THE BODY
Blood reenters the left
artrium of the heart via
the pulmonary vein
blood on the left side
of the heart is
oxygenated and is
pumped into the body
by the left ventricle
through the aorta
GUARDING YOUR HEART
The heart is very important and is therefore
carefully protected
the ribs protect the heart from being crushed
or bumped, thus allowing the heart to beat
freely without external pressure
the heart is also protected within the thorax
by the pericardium, which is fluid filled to
prevent friction inside the chest cavity
HEART RATE
 The heart is made up of specialized muscle (myogenic
muscle) which contracts without outside nervous
stimulation
 because the heart is made up of this special muscle, it
needs special controls
 the heart is controlled by two nodes that are within the
heart itself
 the first node is the sinoatrial node (SA node), and is
sometimes called the “pace maker” of the heart
 the second node is the atrioventricular node and it serves as
a conductor, passing impulses to the rest of the heart
SOUNDS OF THE HEART
 There are two sounds
associated with the heart,
the lubb and the dubb
 the lubb sound is produced
when the ventricles
contract and the
atrioventricular valves
close
 the dubb is produced when
the semilunar valves close,
therefore preventing blood
from flowing back into the
ventricles
LISTEN TO YOUR HEART
Doctors use various methods
to check your heart
the stethoscope is commonly
used to hear your heart beat
the sphygmomanometer
measures your blood pressure
that your heart exerts with
each contraction of the
ventricles
TECHNO TOOLS
 Doctors have many ways
of testing the health of
your heart
 an electrocardiograph is
used to check the
regularity of your heart
beat and your heart rate
 it can also be used to
watch heart attack victims,
and allow doctors a look
to help determine any
damage that was caused
HEART HEALTH
It is very important to exercise and eat
healthy to help maintain heart health.
There are times when heart health is not
maintained, and this is when medicine gets
involved.
Credits
Clip art from Microsoft Clipart
Pictures from Yahoo! Picture Gallery