the cardiovascular system

P wave

contraction

PR Segment

time it takes impulse to get to the AV node

QRS Complex

electrical depolarization of the ventricles

ST Segment

ventricles contract

T Wave

ventricular repolarization

Arteries

oxygenated, thick muscular walls, pulse to circulate blood

Veins

deoxygenated, thinner walls, valves backward flow of blood

Hypertension

high blood pressure

Hypotension

low blood pressure

Systole (top number)

pressure on walls of arteries during contraction

Diastole (bottom number)

pressure on walls of arteries during relaxation

Left ventricle

strongest, pumps to rest of body

Flow of blood

Vena cava, R atrium, AV valve, R ventricle, P valve, P artery, LUNGS, P veins, L atrium, Mitral valve, L ventricle, Aortic valve, Aorta, out

Tricuspid valve AV

prevents backward flow of blood to R atrium

Mitral valve AV

prevents backward flow of blood to L atrium

Pulmonary valve (semilunar)

prevents backward flow of blood to R ventricle

Aortic valve (semilunar)

prevents backward flow of blood to L ventricle

Apex

tip of heart/L ventricle

Septum

wall separates L and R sides of the heart

Sinoatrial SA

pacemaker, sends electrical impulses to depolarize heart to contract

Atrioventricular AV

temporarily delays impulse to ventricles, all of blood emptied from atria

Bundle of HIS, AV Bundle

transmits impulse from AV node to the ventricles

Bundle branches

transmits impulse from the bundle of HIS to the Purkinje fibers

Purkinje fibers

receive the impulse in the ventricles causing them to contract

Capillaries

smallest blood vessels, diffusion of gases, nutrients, and waste occur between blood and body cells

Great Saphenous Vein GSV

longest vein

Aorta

longest artery