Module 10 Flashcards
pulmonary circulation
circulation through lungs provides ability to transfer oxygen from outside to inside the body
systemic circulation
blood flow to heart muscle supports heart’s work in pumping oxygenated blood to body
coronary circulation
oxygen and nutrients are distributed to body
systole
period of contraction while heart pumps blood into circulation
S1 = “lub”
mitral and tricuspid valves close at start of systole
S2 = “dub”
aortic and pulmonary valves close at end of systole
diastole
period of relaxation that occurs as chambers fill with blood
phases
rapid depolarization (loss of resting membrane potential), early repolarization, plateau, rapid repolarization (restoration of resting membrane potential), resting phase
action potentials
stimulate cardiac contraction and relaxation
electrical action
occurs in myocardium due to certain concentration of ions
extracellular
Na+ and Ca2+
intracellular
K+
intracellular state is
negatively charged (polarized)
action begins when
Na and Ca enters the cell and K leaves the cell, charge is reversed and now is depolarized (muscles contracting)
Stroke volume (SV)
amt of blood the heart pumps each beat
