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 – 4:11

B. Composition

1. plasma – liquid part of blood

Solid Parts2. 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)

Antibody

(fights antigen)

A A anti-B

B B anti-A

AB A, B neither

O 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 – 4:11

II. HeartA. 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 – 4:33

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 – 4:17

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!!!