Transcript dereks-presentation-almost-done-really-this-time-i

By Derek.Herridge
Block D. Mr.T
A journey into the body’s most
important function.
Structure of The Heart

The heart is a very
complicated organ. In
order to understand it
more, people draw
diagrams that show
it’s stucture.
Location
In the human body, the
heart is normally situated
in the left of the middle
of the thorax, underneath
the breastbone. The
heart is usually felt on the
left side because the left
ventricle is stronger. The
left lung is also smaller
than the right lung
because the heart
occupies most of the left
hermithorax.
Heartbeat

The heart works as a
pump to send oxygen rich
blood throughout the
body. A human heart
beats on average of
100000 times per day. In
that time, it pumps more
than 4300 gallons of
blood throughout the
entire body. The human
body has about 5.6 liters
of blood, all of which
circulates through the
body three times every
minute.
Cycle of the Blood

The hearts cycle starts when
oxygen poor blood from the
body flows into the right
atrium. Next, blood flows
through the right atrium to the
right ventricle, which serves as
a pump that sends blood to
the lungs. Within the lungs,
the blood releases waste
gasses and picks up oxygen.
This newly oxygen enriched
blood returns from the lungs to
the left atrium. Then blood
flows from the left atrium to
the left ventricle. Finally, the
left ventricle pumps blood all
throughout the body.
Structures of the Heart Part 1
Superior vena cava: One of the two main veins
bringing deoxygenated blood from the body
to the heart. Brings blood from upper body.
Inferior vena cava : One of the two main veins
bringing deoxygenated blood from the body
to the heart. Brings blood from lower body.
Right Atrium: The upper right chamber of the
heart. Receives deoxygenated blood from
the superior vena cava and the inferior vena
cava. Blood here flows to the right ventricle
through the open tricuspid valve.
Right Ventricle: The lower right chamber of the
heart. Receives blood from the right atrium
as it contracts. Then sends blood to the
lungs to be reoxygenized. The right and left
ventricles contract simultaneously, but
because the right ventricle is thinner than
the left, it produces a lower pressure than
the left when contracting.
Structures of the Heart Part 2
Aorta: The central conduit from the heart to the body, the aorta
carries oxygenated blood from the left ventricle to various parts of
the body as the left ventricle contracts.
Left Atrium: The upper left chamber of the heart. The left atrium
receives oxygenated blood from the lungs through the pulmonary
veins. Then sends blood to left ventricle.
Left Ventricle: The lower left chamber of the heart, receives
oxygenated blood from the left atrium. The left and right ventricles
contract simultaneously, however, because the left ventricle is
thicker than the right, it produces a higher pressure than the right
when contracting. The higher pressure is necessary to pump blood
through the body.
Tricuspid Valve: One of the four one way valves that keeps blood
flowing properly through the various chambers of the heart.
Standing between the right atrium and the left ventricle, the
tricuspid valve is the first valve that blood encounters as it enters
the heart.

Structures of Heart part 3
Aortic Valve: One of the four one way valves that keeps
blood flowing properly through the various chambers of
the heart. The aortic valve separates the left ventricle
from the aorta.
Mitral Valve: One of the four one way valves that keeps
blood flowing through the various chambers of the heart.
The mitral valve separates the left atrium from the left
ventricle.
Septum: The wall between the two upper chambers of the
heart( the left and right atrium.)
Pulmonary Artery: The pulmonary arteries carry blood from
the heart to the lungs and vise versa.
The Heart Muscle
A powerful muscle slightly larger
than a clenched fist. It is
composed of four chambers and
sends oxygen rich blood
throughout the body.
Heart disease and problems
There are a number of different heart diseases that one could obtain from various
effects such as smoking. Smoking is very dangerous for the body’s heart and lungs
because it is filled with deadly poisons.
M.U.G.A scans of heart
MUGA scans allow doctors to see if everything is
functioning properly in a persons heart. Its done by
injecting a substance in the blood stream that is sensitive
to radioactive waves, then once the waves enter and leave
the heart, doctors can see if a persons heart is
functioning normally.
Ultrasound Scans of heart
Ultrasound is another way to
check the heart functioning.
Basically, a machine emits sound
than has enough depth to
penetrate some organs, and not
others
M.R.I Scan
M.R.I stands for magnetic
resonance imaging. It is a fairy
new technique that has been
used since the 1980’s. The M.R.I
uses magnetic radio waves,
meaning there is no exposure to
X-rays, or another form of
dangerous radiation.