Topic: Circulatory System
Aim: Explain the function and structure of the
circulatory system.
Do Now: EXTRA CREDIT on the small
paper: Why is everyone wearing red today?
HW: Digestive and Circulatory Castle
Learning due Tuesday, February 23rd.
Today is Heart Health
Awareness Day!
Heart disease and stroke kill 1 in 3 women,
yet it’s 80% preventable.
Heart disease is the
leading cause of
death in women over
age 40, especially
after menopause.
Every year, more
than 400,000 U.S.
women die of heart
disease. This
translates to
approximately one
death every minute.
http://www.youtube.com/watch?v=NYB-rJZQt4w
Circulatory • TRANSPORT
substances
System
Function
throughout the
body
https://www.youtube.com/watch?v=PgI80Ue-AMo
Heart Facts
• Hold out your hand and make a fist.
If you're a kid, your heart is about
the same size as your fist, and if
you're an adult, it's about the same
size as two fists.
• Your heart beats about 100,000
times in one day and about 35
million times in a year. During an
average lifetime, the human heart
will beat more than 2.5 billion times.
Heart • Cardiac muscle
R
L
Parts
of
the
heart
1.Atria:
• Upper
chambers
• RECEIVE
blood
2. Ventricles:
• Lower
chambers
• PUMP blood
Which
chambers
are more
muscular?
Atria or
ventricles?
Why?
3. Septum = wall
that
separates
right & left
sides
4. Valves = bw atria and ventricles
Lub
If you listen to
your heartbeat,
it makes a lub
dub sound. What
you hear is the
sound of the
valves closing as
they pump 4,300
gallons of oxygen
rich blood a day.
Dub
• Tricuspid valve: bw the R atrium and
ventricle
• Mitral valve: bw the L atrium and ventricle
• Pulmonary valve: bw the R ventricle and
pulmonary arteries
• Aortic valve: bw the L ventricle and aorta
E
Valves
C Left
atrium
Left
Ventricle
A Right
D
Atrium
B
Right
Ventricle
E
Valves
Blood
flow in
the
heart
• Right side: DEOXY blood
–To LUNGS
• Left side: OXY blood
–To all body parts
RIGHT
(deoxygenated)
LEFT
(oxygenated)
Blood pumped on each side of the heart
DOES NOT MIX!!
• Vena Cava: Carry DB from the body to the
right side of the heart
• Pulmonary arteries: carry DB to the lungs
• Pulmonary veins: carry OB from the lungs
back to the left side of the heart
AORTA
Is the aorta attached to the right or left side?
So what kind of blood does it carry?
Where does this blood go?
• Aorta: largest artery in the body
– Carries OB from the left side of the heart to
the rest of the body.
•
•
•
•
•
•
•
•
•
•
•
Right atrium (DB)
Right ventricle (DB)
Pulmonary arteries (DB)
Lungs (OB)
Pulmonary Veins (OB)
Left atrium (OB)
Left ventricle (OB)
Aorta (OB)
Rest of the body
Vena Cava (DB)
Right atrium (DB)
Let’s summarize…
1. Explain the function of the circulatory system.
To transport materials throughout the body
2. Identify the upper chambers. Right and left atria
3. Identify the lower chambers.Right and left ventricles
3. Explain the importance of heart valves.
They prevent the backflow of blood.
4. Why is the septum so important?
To prevent the mixing of oxy and deoxy blood..
5. Where is deoxygenated blood pumped to? Lungs
6. Where is oxygenated blood pumped to? Rest of the
body
Review: Identify the structure described.
1. Chamber that receives blood. Atria
2. Prevents the backflow of blood. Valves
3. Chamber the pumps blood out of the
heart. Ventricles
4. Wall of muscle separating the right and left
side of the heart. Septum
5. Chamber that pumps oxy blood. Left ventricle
Right atrium
6. Chamber the receives deoxy blood.
7. Chamber that pumps deoxy blood.
Right ventricle
8. Chamber the receives oxy blood Left atrium
Suerior vena cava
3- Pulmonary
arteries
2- Pulmonary
veins
10 - aorta
5 - Pulmonary
arteries
6 - Pulmonary
veins
8- left
ventricle
7- right ventricle
1- Inferior vena cava
http://www.brainpop.com/health/bodysystems/circ
ulatorysystem/
http://www.brainpop.com/health/bodysystems/hea
rt/
Review: Identify the part of the heart being
described.
1. Chamber that receives oxygenated blood.
2. Wall that separates the right and left side of
the heart.
3. Chamber that pumps out deoxygenated blood.
4. Chamber that receives deoxygenated blood.
5. Prevents the backflow of blood between atria
and ventricles.
6. Chamber that pulps out oxygenated blood.
Atherosclerosis
Autopsy specimen of
aorta has been opened
lengthwise to reveal
luminal surface studded
with lesions of
atherosclerosis.
Coronary atherosclerosis
Hypertension
Coronary Thrombosis
• Heart attack
• Caused by
BLOCKAGE of
coronary artery
• O2 does not
get to heart
muscle
http://www.smm.org/heart/heart/in-out.htm
http://www.smm.org/heart/heart/pumping.ht
m