circulatory Flashcards
3 layers of heart
- epicardium
- myocardium
- endocardium
septum
seperates chambers of the heart
superior atria
low pressure, receives blood
inferior ventricles
high pressure area, removes blood
pulmonary semilunar valve
between right ventricle and pulmonary artery, sends blood from heart to lungs
tricuspid valve
between right atrium and right ventricle
mitral valve
bicuspid valve between left atrium and left ventricle
aortic semilunar valve
between left ventricle and aorta
arteries
carry blood away from heart
veins
carry blood to the heart
systole
high pressure caused by ventricular contraction
diastole
pressure in arteries when ventricles are relaxed
endomysium
loose matrix of connective tissue that supplies heart cells with oxygen
pacemaker cells
self depolarizing, keep heart beating at same rhythm and coordination
SA node
natural pacemaker near right atrium
atrioventricular bundle (of His)
path electricle impulse takes to the bottom of heart
purkinje fibers
trigger depolarization and cause ventricles to contract
fibrillation
uncoordination of heart
arterioles
mini arteries that branch into caplillaries
venules
smallest vein component that sucks blood from capillaries
lumen
open space in vessels that hold the blood
3 layers of blood vessel
- tunica intima-surrounds lumen
- tunica media- contract and expand
- tunica externa- reinforces
venous valves
keep blood from back flowing
cardiac output
stroke volumn X heart rate
