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