cardiovascular system 1.aorta 2.sup vena cava 3.pul artery 4.pul vein 5.right atrium 6.r ventricle...

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CARDIOVASCULAR SYSTEM

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CARDIOVASCULAR SYSTEM

1. Aorta2. Sup vena cava3. Pul artery4. Pul vein5. Right atrium6. R ventricle7. Inf vena cava8. Pul artery9. Pul vein10. Left atrium11. L ventricle12. Abdominal aorta

HEART BEAT

http://www-medlib.med.utah.edu/kw/pharm/hyper_heart1.html

Note the flow of blood through the heart (order)

http://www.medlib.com/spi/coolstuff2.htm Why are there 2 sounds but only one

pulse?

Flow of blood

Right side of heartlungs (get O2)left side of heartarteriescapillaries (body)veins right side of heart

http://www.smm.org/heart/heart/circ-f.htm

HEART BEAT

Why are there two sounds but only one pulse?

Beat starts with SA node in upper right atrium. SA node is a group of

self-stimulating cells that seems to be in charge of heart rhythm

HEART BEAT 2

Wave of depolarization spreads across atria through Purkinje fibers and the atria contract.

The AV node in the bottom of the right atrium is stimulated and the ventricles are stimulated to contract

ECG

Abnormalities of ECG

Differences in waves from normal are used for diagnosis

They are not often as obvious as those in the accompanying illustration

Heart disease

# 1 killer in this country Not really heart disease

but coronary blood vessel disease

Blocked artery causes heart muscle death

When heart muscle dies, regular contraction of the heart is blocked

Causes

Genetics Evidence that genes have

much to do with deposits of fat in artery walls

Diet Lack of exercise

Evidence that exercise causes production of proteins that remove plaques from artery walls

“Cures” for blocked heart coronary arteries

Balloon angioplasty

Stents Tube is put into artery

to allow blood to pass through

Coronary bypass