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atrioventricular (AV) node
specialized mass of conducting cells located at the atrioventricular junction in the heart
atrioventricular (AV) bundle
bundle of specialized fibers that conduct impulses from the AV node to the right and left ventricles; also called bund of his
atrioventricular (AV) valves
valve that prevents backflow into the atrium when the connected ventricle is contracting
a sensory nerve ending in the wall of the carotid sinus or aortic arch sensitive to vessel stretching
tiny white collagen cords attached to AV valves; "heart strings" which anchor the cups to the papillary muscles protruding from the ventricular walls
left coronary artery
runs toward the left side of the heart and then divides into its major branches ;Anterior intraventricular artery & circumflex artery
right coronary artery
courses to the right side of the heart ; branches to Right marginal artery & Posterior interventricular artery
includes all events associated with the blood flow through the heart during one complete heart beat- atrial systole and diastole followed by ventricular systole and diastole
glistening white sheet of endothelium (squamous epithelium) resting on a thin connective tissue layer; lines the heart chambers & covers the fibrous skeleton of the valves
double-walled sac that surrounds the heart; the outermost layer; resposible for protection, anchors surrounding structures, prevents over-filling
"oval door" connects the two atria and allows blood entering the right heart to bypass the pulmonary circuit and the collapsed, nonfunctional fetal lungs
forces the pump (the heart) has to develop to circulate blood through the cardiovascular system; movement of blood
middle layer of the heart wall, composed mainly of cardiac muscle and forms bulk of the heart, contractile layer of the heart
slitlike cavity between the parietal and visceral layers, which contains a film or serous fluid, creates a friction free environment as the heart beats
a law of physiology stating that blood flow through a vessel is directly proportional to the radius of the vessel to the fourth power.
blood vessels that carry blood to and from the lungs which serves as gas exchange
long strands of barrel shaped cells with few myofibrils, complete pathway through the interventricular septum
semilunar SL valves
aortic and pulmonary; guard the bases of the large arteries issuing from the ventricles and prevent backflow into the associated ventricles
sinoatrial SA node
generates impulses 75 times a minute; sets the pace for the heart and contains the pacemaker
blood vessels that carry the functional blood supply to and from all body tissues.
is the volume of the blood pumped out by one ventricle with each beat, about 70mL/beat
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