Download The Circulatory System

The Circulatory
System
The Human Body Lesson
The heart is the main
organ of the
circulatory system.
The circulatory
system’s job is to
pump oxygen rich
blood to all parts of
your body.
It then pumps carbon
dioxide waste to the
lungs to be exhaled.
The Circulatory System
• The heart is about the
size of your fist.
• It is a 4 chambered
organ, divided into
two sides, left and
right.
• The top chambers are
called atriums, the
lower chambers are
ventricles.
The Heart
This is what your heart looks like.
This is NOT what your heart looks like.
• The Right Atrium
receives old blood from
the Vena Cava. It holds
the blood briefly before
dropping down into the
Right Ventricle.
• The Right Ventricle
pumps the tired blood full
of CO2, up to the lungs
for fresh oxygen.
• The blood leaves through
the pulmonary artery.
Chambers of the Heart
 The pulmonary veins bring
the freshly oxygenated
blood back to the heart.
 The Left Atrium receives
the fresh blood from the
pulmonary veins. It holds
the blood briefly before
dropping to the Left
Ventricle.
 The Left Ventricle is the
largest and strongest part of
the heart. It pumps the
oxygenated blood out to the
body.
This heart has been cut in half, showing the
inside of the ventricles.
Chambers of the Heart
• The heart is made of
cardiac muscle. Unlike
other muscles in your
body, it never rests.
• The septum is a wall of
tissue that separates the
left and right side of the
heart.
• Valves in the heart keep
the blood flowing in one
direction.
Mola Ram here is definitely not a
cardiologist.
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• Blood vessels are the
“tubing” that carries
blood to all parts of the
body.
• Children have about
60,000 miles of blood
vessels in their bodies, an
adult can have up to
100,000 miles!!!
• Your blood makes a
complete trip through the
body in about one
minute!
The Blood Vessels
• Arteries are large, strong
walled tubes that lead out
from the heart to the
body.
• Arterioles are smaller
tubes that branch off of
the arteries. (Similar to
Bronchi and Bronchioles)
• Capillaries are the
smallest blood vessels.
They connect the arteries
to veins.
The Blood Vessels
• Veins are large, strong walled
tubes that lead from the body
back to the heart.
• They carry tired blood full of
CO2.
• The Vena Cava is is the largest
vein in the body. It takes blood
into the Right Atrium.
• The Aorta is the largest artery
in the body. It leaves the heart
to take blood out to the body.
• The four parts of the
circulatory system are the
heart, arteries, veins, and
capillaries.
The Blood Vessels
• Blood is made of many
cells floating through a
watery goo called
plasma.
• Plasma is the liquid part
of blood and is 92%
water but contains
proteins and salts.
• Blood is broken down
into four parts; plasma,
red blood cells, white
blood cells, and
platelets.
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• Red Blood Cells carry
oxygen and food to the
cells of the body.
• They contain a red
pigment called
Hemoglobin which
allows the cells to absorb
oxygen and co2.
• Red Blood cells live for
about four months.
The Three Types of Blood Cells
White Blood Cells fight off
disease and infection.
They are broken down
into two types.
Granulocytes fight off
infection.
Lymphocytes fight off
viruses and germs. They
send out antibodies that
kill the germs.
This white blood cell is on patrol, looking for
any germs to destroy.
The Three Types of Blood Cells
• Platelets are specialized
cells that plug up any
leaks in the blood vessels
from cuts.
• This process is called
clotting.
• All three types of blood
cells are formed in your
bone marrow.
Platelets have this “stringy” shape to
help them stick together.
The Three Types of Blood Cells