Overview Flashcards
Automaticity
heart beats by itself
myogenic
originates within heart/muscle
Function of Sinoatrial node
specialized myocytes
initiates heartbeat
Atrioventircular node located? Fcn?
between atria/ventricles
Slows conduction - allow atrial contraction to precedes ventricular contractions
His-Purkinje system
bundle of his, L/R Bundle branches, Purkinje fibers (inner wall of ventricles)
Coordinated contraction of ventricles
R atrium * R ventricles supplied by
Right main coronary artery
LA/LV supplied by
Left coronary artery
LCA bifurcates to
Left anterior descending
Circumflex arteries
Coronary veins drains into:
coronary sinus (posterior of heart - drains into RA)
BV: inner layer, connective tissue/vascular endothelium, signaling
tunica intima
BV: Site of atherosclerotic plaque formation
tunica intima
BV: Outer most layer
tunica adventitia
BV: Connective tissue (collagen/elastin)
tunica adventitia
BV: Middle layer/ control vessel diameter
Tunica Media
Precapillary sphincter
smooth muscle bands at junction of arterioles and cap bed
Blood flow in cap bed controlled by:
Pressure gradients/precapillary sphincter
Lymph is _____ ______ fluids
filtered interstitial
Lymphatic capillaries differ:
porous blind end capillary
Lymphatic system is ___ pressure, ___ - way valves
low, one
Flow of lymph/Blood per day
2-4 vs 7000
General blood flow
aorta - large artery - small artery - arteriole - capillary - venule - vein - vena cava
