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structures within the heart that open and close with the heart beat to regulate the one way flow of blood
Pulmonary semilunar valve
heart valve opening from the right ventricle to the pulmonary artery (luna = moon)
valves of the veins
valves located at intervals within the lining of veins, espeicially in the legs, which constrict with muscle action to move the blood returning to the heart
circulation of blood throughout the body via arteries, arterioles, capillaries, venules, and veins to deliver oxygen nutrients to body tissues
circulation of blood through the coronary blood vessels to deliver oxygen and nutrients to the heart muscle tissue
circulation of blood from the pulmonary artery through the vessels in the lungs and back to the heart via the pulmonary vein, providing for the exchange of gases
to expand; period during the cardiac cycle when blood enters the relaxed ventricles from the atria
to contract; period during the cardiac cycle when the heart is in contraction and blood is ejected through the aorta and the pulmonary artery
sinoatrial (SA) node
the pacemaker; highly specialized, neurological tissue impeded in the wall of the right atrium; responsible for INITIATING electrical conduction of the heartbeat, causing the atria to contract and firing conduction of impulses to the AV node
atrioventricular (AV) node
neurological tissue in the center of the heart that receives and amplifies the conduction of impulses from the SA node to the bundle of His
bundle of His
neurological fibers extending from the AV node to the right and left bundle branches that fire the impulse from the AV node to the purkinje fibers
Purkinje fibers / network
fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract
change of a myocardial cell from a polarized (resting) state to a state of contraction (de = not ;polarization = resting)
recharging of the myocardial cell from a contracted state back to a resting state (re = again; polarization = resting)
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