CARDIOVASCULAR SYSTEM

1.Aorta 2.Sup vena cava 3.Pul artery 4.Pul vein 5.Right atrium 6.R ventricle 7.Inf vena cava 8.Pul artery 9.Pul vein 10.Left atrium 11.L ventricle 12.Abdominal aorta

HEART BEAT medlib.med.utah.edu/kw/pharm/hyper_he art1.html medlib.med.utah.edu/kw/pharm/hyper_he art1.html Note the flow of blood through the heart (order) Why are there 2 sounds but only one pulse?

Flow of blood Right side of heart  lungs (get O2)  left side of heart  arteries  capillaries (body)  veins  right side of heart

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