Cardiovascular System - Exam 3 Flashcards
definition of systole
contraction & emptying of heart
definition of diastole
relaxation & filling of heart
definition of bradycardia
decrease in heart rate
definition of tachycardia
increase in heart rate
definition of cardiac output
total volume of blood ejected by heart per minute
4 chambers include
L & R atriums and L & R ventricles
atrioventricular valves
“lub”, AV valves, separate atria & ventricles
AV valve function
prevent backflow of blood during systole, open vs closed due to pressure changes
2 types of AV valves
mitral & tricuspid
mitral valve
left AV valve
tricuspid valve
right AV valve
semilunar valves
“dub”, between ventricles & great arteries
semilunar valve function
prevent backflow of blood from aorta & pulmonary arteries during diastole
2 types of semilunar valves
aortic & pulmonary
aortic valve
between LV & aorta
pulmonary valve
between RV & pulmonary artery
3 types of cardiac cells include:
myocardium, pacemaker, conduction
working myocardial cells / myocardium
contraction & impulse conduction
pacemaker cells
automatic rhythmical electrical discharge
conduction cells
conduct action potentials providing excitatory system that controls rhythmical beating
SA node
sinoatrial node, normal pacemaker
sinus node
small strip of specialized cardiac muscle cells
AV node
delays impulse conduction from atria to ventricles
Purkinje fibers
lead the AV node impulse through the AV bundle into the ventricles
