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What is the leading cause of death in the US?
A.
B.
C.
D.
Car Accident
Genetic Diseases
Cardiovascular Diseases
Natural Causes
Cardiovascular Diseases
• Includes heart attacks, strokes, & high blood pressure
What can we do to prevent cardiovascular disease?
The Circulatory System
The Heart
• Near the center of the chest, slightly to the left
• Atrium (right & left): upper chambers of the heart
• Ventricle (right & left): lower chambers of the heart
Body
Aorta
Superior Vena
Cava
Left Atrium
Right Atrium
Through
tricuspid
valve
Pulmonary
Vein
Through
bicuspid
(mitral)
valve
Left Ventricle
Right Ventricle
Pulmonary
Artery
Lungs
Video
Circulatory & Respiratory Systems
• Remember that your body’s cells need oxygen to make
energy, but they produce carbon dioxide as a waste
product.
– That’s why we breathe in oxygen & exhale carbon dioxide!
• When your blood flows through the body, it drops off O2 to
your cells & picks up CO2.
• When the blood gets back to the lungs, it drops off the CO2
waste & picks up more O2.
Pathway of Blood through the Heart
1.
A large vein called the superior
vena cava brings the blood
from the upper part of the
body to the heart, where it
enters the right atrium.
2.
The blood is pumped out of
the right atrium into the right
ventricle.
3.
Travels through the pulmonary
artery to the lungs where it
picks up oxygen.
Pathway of Blood through the Heart
4. From the lungs, blood travels through the pulmonary veins and
returns to the heart, where it enters the left atrium.
5. Finally, the blood is forced from the left ventricle into the aorta
which carries it to the tissues of the body.
Which 2 chambers of the heart carry oxygenated blood?
A.
B.
C.
D.
Left & Right Ventricles
Left & Right Atriums
Left Atrium & Left Ventricle
Right Atrium & Right
Ventricle
When blood flows into the lungs, it drops off CO2 & picks up O2.
From the lungs, the blood flows into the left atrium, then to the left
ventricle.
Hemoglobin is a protein that carries oxygen to
the body’s cells. Where is it found?
A.
B.
C.
D.
Tissues of the Heart
Tissues of the Lungs
Bone Marrow
Blood
What’s blood made of?
• Red Blood Cells: transport oxygen to the body via
hemoglobin
• White Blood Cells: part of the immune system
• Platelets: involved in blood clotting
• Plasma: fluid portion of blood
– 90% water, 10% dissolved substances
Within a tiny drop of
blood, there are…
5 million red blood cells…
300,000 platelets…
10,000 white blood cells!
Which type of blood cells play a direct role in
the immune system?
A.
B.
C.
D.
Red Blood Cells
White Blood Cells
Platelets
All of the above
3 Types of Blood Vessels
• Veins: blood vessels that return blood to the heart
• Arteries: blood vessels that carry blood away from the heart
to the body tissues
• Capillaries: smallest blood vessels, bring nutrients & oxygen
to tissues & absorb carbon dioxide & waste products
All of the blood vessels
in your body measure
about 60,000 miles!
Which type of blood vessels carry
deoxygenated blood (no oxygen)?
A.
B.
C.
D.
Veins
Arteries
Capillaries
None of the above
Which type of blood vessels deliver nutrients from
the food you eat to your body’s cells?
A.
B.
C.
D.
Veins
Arteries
Capillaries
None of the above
Pulmonary Vein vs. Pulmonary Artery
• The only vein that carries
oxygenated blood is the
pulmonary vein.
• The only artery that carries
deoxygenated blood is the
pulmonary artery.
Remember! Arteries carry blood
away from the heart, while veins
carry blood to the heart!
Blood Clotting
• An important process to stop
excess bleeding if a blood
vessel is injured
• Platelets & proteins in the
plasma work together to form a
blood clot to cover the injury.
• Sometimes, clots form in the
blood vessels without there
being an injury. These can be
DANGEROUS!
Video from 1:55
What could happen if someone gets a blood clot?
• Heart Attack: lack of oxygen to the heart
• Stroke: lack of oxygen to the brain
• Tissue Damage: due to lack of oxygen