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CIRCULATORY
SYSTEM
COOL FACTS…….
▪ The body of an adult contains over 60,000 miles of blood
vessels!
▪ Strung together end to end, your blood vessels could
circle the globe 2 1/2 times!
▪ An adult's heart pumps nearly 4000 gallons of blood
each day!
▪ Your heart beats some 30 million times a year!
What is it?
▪ Read page 413-1st paragraph on
415
▪ Define: Circulatory system
▪ It is made up of three things:
▪ The Heart
▪ The Blood Vessels
▪ The Blood
The circulatory system is the body’s delivery system. Delivers Oxygen and removes wastes!
Your Heart….
▪ How big?
▪ About the size of your fist
▪ Located?
▪ In the center of your chest under your
sternum
▪ How many times a minute does it
beat?
▪ Count your heartbeat for 10 seconds
and multiply by 6
The Heart…..
▪ The right and left sides of
the heart are divided by a
wall called the:
▪ Septum
▪ The septum prevents :
▪ the mixing of oxygen rich
blood and oxygen poor
blood
The Heart….
▪ On each side of the septum are
two chambers
▪ The upper chamber is called the
atrium.
▪ It receives blood
▪ The lower chamber is called the
ventricle.
▪ It pumps out blood.
How does blood flow through the heart?
“BLUE SIDE”
▪ Deoxygenated blood passes from
right atrium into right ventricle
and then goes to the lungs to
pick up oxygen.
1
3
2
1
2
3
2
• Deoxygenated blood (low on
oxygen)
• Wants to get to the lungs
• Goes to the RIGHT atrium
• And the RIGHT Ventricle
• Goes to the lungs
• Picks up the oxygen
How does blood flow through the heart?
“RED SIDE”
From the lungs, the oxygenated
blood goes back to the heart to the
left atrium and then the left
ventricle and then pumped to the
rest of the body.
1
•The blood has become
oxygenated
•Coming from the lungs
2
•Goes back to the heart to LEFT
atrium
•Then LEFT ventricle
3
•The blood (with oxygen) is
pumped to the body
•The body uses up the oxygen
and the process starts over
3
1
2
2
▪ Flaps of connective tissue, called VALVES,
are located between the atria and
ventricles
▪ When blood is flowing the values are open
▪ When the ventricles contract, the valves
close to stop blood from going back into
the atria
▪ This system of valves keeps blood flowing
in one direction
circulation video
What is blood made of?
▪ READ page 415
▪ Made of equal parts of solids and
liquids
▪ The liquid part of blood is called:
▪ Plasma (mostly water)
▪ The solid parts are blood cells
▪ Red blood cells
▪ White blood cells
▪ Platelets
Red Blood Cells
Red Blood Cells:
▪ Most numerous type
▪ Transport oxygen
▪ Disk shaped
▪ Made in the bone marrow
White Blood Cells
White Blood Cells:
▪ Guard against infection and
attack bacteria
▪ When fighting, the number of
WBC in your body increases
Platelets
▪ Platelets
▪ Aid the body in blood clotting
▪ Too low-excessive bleeding
▪ Too high-blood clots
▪ blood cells video
Blood Vessels- 3 types
a.
Arteries
b.
Veins
c.
Capillaries
ARTERIES:
▪ Carry blood Away from heart to other
parts of the body
VEINS:
▪ Carry blood from the body back to the
heart
CAPILLARIES
▪ Tiny blood vessels that connect veins and
arties to the body’s cells (gases are
exchanged)
Problems of the Circulatory system
▪ READ Pages 416 & 417 & Define:
▪ Hypertension: high blood pressure
▪ Heart attack: blockage of blood flow to the heart
▪ Stroke: results from blood clots that block vessels in the brain, or a rupture
of a blood vessel
▪ Arteriosclerosis:
condition in which arteries harden, reducing the amount
of blood that can flow through them
▪ Anemia:
abnormally low level of hemoglobin, a protein that binds to oxygen
in red blood cells
▪ Leukemia:
type of cancer in which large amounts of abnormal white blood
cells are produced which interferes with the production of other blood cells
Clogged Arteries
Care of the Circulatory System
▪ Get 60 minutes of activity on
most days
▪ Limit the amount of fat in your
eating plan; especially saturated
fat
▪ Increase fiber
▪ Avoid tobacco
▪ Manage stress