The Cardiovascular System
Just Breathe!
Functions of the Cardiovascular
System
Comprised of the heart
and all of the blood
vessels
It circulates the blood
Carries oxygen and
nutrients to body cells
Carries carbon dioxide
from your cells
Oxygen to lungs, waste to
kidneys
Structure of the Cardiovascular
System
Heart, blood, blood
vessels
Heart: Pump that
makes the CV system
work. It never rests
Made of myocardium,
which relaxes and
contracts rhythmically
How blood moves through the
heart
http://www.bostonscie
ntific.com/templatedat
a/imports/HTML/lifeb
eatonline/winter2007/l
earning.shtml
How the heart beats
Top of the right atrium is an area of muscle
that acts as a natural pacemaker
This starts the heart’s electrical system
Stimulates the muscles to contract
Within the heart, there are four “one-way”
values that keep the blood flowing in the
right direction
Blood
Delivers oxygen,
hormones, nutrients to
the cells
Plasma is mostly
water
Hemoglobin: oxygencarrying protein
White blood cells:
part of immune system
Blood Vessels
Network of 60,000
miles of blood vessels
in your body
Arteries, capillaries,
and veins
Arteries
Carry blood away
from the heat
Thick elastic walls
As arteries move away
from the heart, the
branch progressively
smaller into arterioles
Capillaries
Small vessels that
carry blood between
arterioles and venules
Responsible for the
exchange of gases,
nutrients, wastes
Play a role in
temperature regulation
Platelets
Cells that prevent body’s loss of blood
Release chemicals at an injury site that
causes them to clump together
Fibrin threats help to form a clot
A scab is formed
Veins
Blood vessels that
return blood to the
heart
Walls are thinner then
that of arteries
Pressure on vessel
walls from the
contraction of
surrounding muscles
move blood
Cardiovascular Problems
Congenital heart defects
Cardiovascular disease
Heart Murmur
Varicose Veins
Anemia
Leukemia
Hemophilia
Respiratory System
Functions of the Respiratory
System
Exchange of gases
between body and
environment
External: exchange of
oxygen and carbon
dioxide that takes place
between air and blood
Internal: exchange
between blood and body
cells
Structure of Respiratory System
Lungs
Larynx
Trachea
Bronchi
Diaphragm
Respiratory Problems
Asthma
Cancer
Bronchitis
Pneumonia
Pleurisy