Download CIRCULATORY SYSTEM

CIRCULATORY SYSTEM
-Blood,
heart, blood
vessels
Introduction to the Circulatory System
–
0:58
I. BLOOD
A. Functions
1. carries food, oxygen, carbon
dioxide, hormones & enzyme
2. transports wastes
3. clots blood
4. helps fight infection
5. distributes heat
Blood –
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B. Composition
1. plasma –
liquid part of
blood
Solid Parts
2. R.B.C. –
carries oxygen
& carbon
dioxide
Anemia – caused
by lack of r.b.c.
or iron
3. w.b.c. – helps
fight infection
4. platelets –
clot blood
C. Blood Types
Blood Types
Antigen
(causes rxn)
A
A
Antibody
(fights
antigen)
anti-B
B
B
anti-A
AB
O
A, B
neither
neither
anti-A, anti-B
- Universal DONOR – type O
(can donate to anyone) – no
antigens
- Universal recipient – type AB
(can receive from anyone) – no
antibodies
Rh factor:
+ or
Rh + : has + antigen
Rh - : has + antibody
Blood –
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II. Heart
A. Chambers/valves
1. right atrium (receives blood from
body)  Right AV (or tricuspid)
valve closes to sound “lub”
2. right ventricle – pumps blood through
to pulmonary (semilunar) valve closes
to sound “dupp”  to lungs (give off
carbon dioxide & takes in oxygen
3. Left Atrium – receives oxygenated
blood from lungs  left AV (or
bicuspid) valve closes to sound “lub”
(at same as right AV valve)
4. Left ventricle – strongest chamber:
pumps out blood through aortic valve
(closes to sound “dupp”)  aorta 
rest of the body
Heart –
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B. Terms
1. Heart attack – clot in heart (usually in
coronary arteries
2. blood pressure – pressure in artery
walls; ex. 120/80 – pressure when
contraction/ relaxation of ventricles
3. heart murmur – faulty valve (often)
4. CPR – cardio (heart); pulmonary (lung)
recessitation
III. BLOOD VESSELS
A. Arteries – carry blood AWAY from
the heart; most carry oxygen & are
bright red; thicker & stronger
B. Arterioles – small arteries
C. Capillaries – connect arterioles to
venules; microscopic; exchange of
gases & nutrient takes place here
between blood & cells
D. Venules – small veins
E. Veins – carry blood to heart; most
carry carbon dioxide & are deep
purple; less elastic; some have
valves;
- varicose veins/hemorrhoids –
flabby veins
F. Other Terms
1. stroke – blood clot in vessel in
brain
2. high blood pressure – pressure
too high in arteries which can lead
to heart attack, stroke, kidney
damage, blindness
Blood Vessels –
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CIRCULATION
Right Atrium  right ventricle 
lungs  left Atrium  left
ventricle  aorta/arteries 
arterioles  capillaries
venules  veins  back to
heart (right atrium)
Healthy Circulatory System –
0:37
Summary –
0:58
THE END!!!