order of blood in heart (10)
vena cava
right atrium
right ventricle
pulmonary artery
lungs (for oxygen)
pulmonary vein
left atrium
left ventricle
aorta
rest of body
4 chambers of heart
right atrium
right ventricle
left atrium
left ventricle
coronary artery
supply oxygen to heart
branch off aorta
artificial pacemaker
control heartbeat if natural pacemaker cells do not work properly
implanted under skin with wire going to heart
produces electrical current to keep heart beating regularly
arteries
carry blood away from heart
strong + elastic walls - high pressure
thick walls
capillaries
carry blood close to every cell in body to exchange substances
permeable walls, 1 cell thick
supply food and oxygen
veins
carry blood to the heart
less thick walls than arteries - low pressure
bigger lumen than arteries
valves - blood flows right way
lumen
hole of blood vessel
