Transcript The Circulatory Systemppt

The Circulatory System
AKA The Cardiovascular System
AKA The Body’s “Transport
System”
• Consists of the heart, blood
and blood vessels.
Used to
1. carry needed substances to
cells and
2. carry waste products away
from cells.
And your blood
3. contains cells to fight
disease.
Needed Substances:
oxygen
glucose
Waste Products:
Carbon Dioxide
Disease Fighters:
white blood cells
The Heart: 2 pumps; 4 sections
• The size of your fist.
• Located in the center of your
chest.
• With each beat, blood is being
pushed through the blood
vessels.
Flow of blood:
• Oxygen depleted blood
• Oxygenated blood
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Vena cava
Right atrium
Right ventricle
Pulmonary Artery (Arteries Away!)
To lungs
In the lungs: CO2 is exchanged for O2.
Oxygenated blood goes back to the heart.
Pulmonary veins (veins IN)
Left atrium
This process keeps
going in a circle…it’s
Left ventricle
not called the
Aorta (largest artery) Circulatory System for
nothing!
To the body
Blood Vessels:
Arteries: (Arteries Away!)
carry blood __________ from the heart.
Carries oxygen poor blood (1
exception=Pulmonary artery). Have thick
elastic walls made of smooth muscle.
Each ventricle is attached to an artery.
Arteries branch into capillaries.
Veins: (veins IN)
Carry blood in to the heart. Low
pressure, Near skin surface.
Thin walls. Oxygenated (1
exception=Pulmonary vein)
Have valves to prevent
backflow.
Capillaries
Microscopic. One cell thick.
Only one blood cell through at
a time.
Where all diffusion happens.
PARTS OF BLOOD
•45% OF BLOOD IS
MADE OF CELLS;
THE REST IS
PLASMA.
PLASMA:
• Straw-colored, liquid part of
blood. 10% are the dissolved
materials that must travel via
the blood, the other 90% is
water. Carries most of the CO2
in the blood.
RED BLOOD CELLS
• Take up oxygen in the lungs
and deliver it to cells.
Produced in the bone
marrow. Thin, disk-shaped
and flexible. Live for about
120 days.
HEMOGLOBIN:
• Iron-containing protein that
gives blood its ability to carry
oxygen. When hemoglobin
combines with O2, blood turns
bright red.
WHITE BLOOD CELLS
• Body’s disease fighters.
There are fewer WBCs than
RBCs. WBCs are bigger
than RBCs. Can live for
months or even years
PLATELETS
• Small pieces of cells help the
blood to clot. They produce a
protein called fibrin that
weaves tiny fibers across a cut
and traps blood cells.
• A scab is simply a dried blood
clot.