Transcript Circulatory System

Cardiovascular System
If your heart…
Beats about 70 times per minute, how
many times does it beat in a day?
100,800
In a week?
705,600
In a year?
36,792,000
Blood
It brings oxygen, nutrients, and other
necessary materials to your body cells and
carries waste products away.
It’s a pathway through which blood can
carry materials throughout your body.
It also regulates body temperature and
water balance.
It’s like city roads…
Delivery truck brings the good stuff;
the garbage truck takes out the bad
stuff.
Heart
The most important muscle in your
body!
It’s like the engine to make your car
go on the road.
Structure of the heart
Has two sides
Each side has two chambers
Atrium- receives blood entering the
heart.
Ventricles- pumps blood from the
heart
Circulations
Pulmonary circulation
Right side of the heart. The pathway
that blood follows from the heart to the
lungs.
Systemic Circulation
Left side of the heart. The route that
blood travels from the heart to most of
the body and then back to the heart.
Regulation of heartbeat
The average adult’s heart beat is 7080 beats/minute while at rest.
What’s your resting heart rate?
Let’s exercise…
Why is your pulse higher when you
exercise?
Target Heart Rate
(220-age) x .60
(220-age) x .80
Those two numbers make up the THR
zone.
Pacemaker
Regulates our heartbeat
We have a natural pacemaker, but
when ours fails, we can get an
artificial one.
Blood Vessels
If all of your blood vessels were
connected, they would extend over
100,000 miles!
Arteries carry blood AWAY from
your heart.
Veins carry blood TO your heart.
Blood vessels continued…
The largest blood vessel is the aorta.
The smallest is a capillary.
Aorta—arteries—arterioles—
capillaries—venules—veins--vena cava
Coronary arteries deliver blood to the
heart tissue.
Blood vessel diagram
Blood Parts Activity
Page 410 in yellow book
In small groups you will need to
create a poster showing what makes
your blood part unique.
Parts are:
Plasma
Red Blood Cells
White Blood Cells
Platelets
Blood parts
Plasma
The liquid part of the blood
Red blood cells
Carry oxygen from the lungs to the body
White blood cells
Help protect the body against diseases and
foreign substances
Platelets
Pieces of cells that start the process of blood
clotting.
Transfusions and blood groups
Transfusion
Blood is taken from one person and then
transferred to someone else.
Blood group (4 different types )
O, A, B, or AB
If you get a transfusion you need the
same type of blood.
Your blood could be + or – depending
on if you have a certain protein in
your blood (Rh factor)
Type AB+ is the universal recipient
Type O- is the universal donor.
Your body is always making new blood.
Blood type graph
What kind of problems can we
have with our heart?
When we’re young
We have a healthy heart and healthy
blood vessels now… But…
If we don’t eat healthy and don’t
exercise, over time there will be some
drastic consequences
Food
Food has fat and cholesterol in it.
If we eat more than our body can
handle, the body will store that extra
“fat” in parts of the body
One of the places that “fat” is
stored, is our blood vessels
If this happens
Then our heart has to work harder
because the pathway isn’t as clear as
it used to be
Arteriosclerosis
The hardening of the arteries.
Caused by smoking, drinking, and
inactivity.
Atherosclerosis
A buildup of cholesterol and other
fatty materials on artery walls.
This restricts the flow of blood
Can occur in coronary blood vessels or
any other blood vessels
When coronary arteries are
blocked
Blood can’t get to the heart
If there is no blood going to the
heart, that part of the heart will
start to die, and this will result in a
heart attack
High Blood Pressure
High blood pressure, or hypertension,
is when someone has a high blood
pressure for an extended period of
time
This occurs when one doesn’t exercise
and has a high fat diet
Hypertension
Can cause a stroke
This happens when blood flow to a
part of the brain is suddenly cut off.
This can cause severe brain damage
and even death
How can you prevent …
Coronary heart disease?
Hypertension?
Strokes?