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atrium
upper right and left chambers of the heart
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endocardium
membrane lining the cavities of the heart
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pericardium
protective sac enclosing the heart composed of two layers with fluid between
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ventricle
lower right and left chambers of the heart
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aortic valve
heart valve between the left ventricle and the aorta
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mitral or bicuspid valve
heart valve between the left atrium and left ventricle
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pulmonary semilunar valve
heart valve opening from the right ventricle to the pulmonary artery
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tricuspid valve
valve between the right atrium and the right ventricle
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arteries
vessels that carry blood fromt he heart to the arterioles
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aorta
large artery that is the main trunk of the arterial system branching from the left ventricle
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arterioles
small vessels that receive blood from the arteries
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capillaries
tiny vessels that join arterioles and venules
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venules
small vessels thta gather blood from the capillaires into the veins
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veins
vessels that carry blood to the heart from the venules
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systemic circulation
circulation of blood throughout the body through arteries, arterioles, capillaries, and veins to deliver oxygen and nutrients to body tissues.
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coronary circulation
circulation of blood throught the coronary blood vessels to deliver oxygen and nutrients to the heart muscle tissue.
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pulmonary circulation
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.
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diastole
to expand; the period in the cardiac cycle when blood enters the relaxed ventricles form the atria.
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systole
to contract; period in the cardiac cycle when the heart is in contraction and blood is ejected through the aorta and pulmonary artery.
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hypertension (HTN)
high BP
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sinoatrial (SA) node
the pacemaker; highly specialized neurological tissue, embedded in the wall of the right atrium, responsible for initiating electrical conduction of the heartbeat.
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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
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bundle of His
neurological fibers, extending from the AV node to the right and left bundle branches, that fire the impulse form the AV node to the Purkinje fibers
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Purkinje fibers
fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract.
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polarization
resting; resting state of a myocardial cell
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depolarization
change of a myocardial cell from a polarized (resting) state to a contraction
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repolarization
recharging of the myocardial cell from a contracted state back to a resting state
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normal sinus rhythm (NSR)
regular rhythm of the heart cycle stimulated by the SA node (average rate of 60 to 100 beats/min)
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arteriosclerosis
thickening, loss of elasticity, and calcification (hardening) of the arterial walls
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atherosclerosis
buildup of fatty substances within the walls of arteries.
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thrombus
a stationary blood clot
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embolus
a clot carried in the bloodstream that obstructs when it lodges
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stenosis
condition of narrowing of a part
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constriction
compression of a part
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occlusion
plugging; obstruction or a closing off.
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ischemia
to hold back blood; decreased blood flow to tissue caused by constriction or occlusion of a blood vessel
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infarct
to stuff; a localized area of necrosis caused by ischemia as a result of occlusion of a blood vessel
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angina pectoris
chest pain caused by a temporary loss of oxygenated blood to heart msucle often caused by narrowing of the coronary arteries
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aneurysm
a widening; bulging of the wall of the heart, the aorta, or an artery caused by congenital defect or acquired weakness.
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claudication
to limp; pain in a limb while walking that subsides after rest; it is caused by inadequate blood supply
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diaphoresis
profuse sweating
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palpitation
subjectie experience of pounding, skipping, or racing heartbeats
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vegetation
to grow, an abnormal growth of tissue around a valve, generally a result of an infection such as bacterial endocarditis.
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