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Vocabulary

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Term
Definition
aorta   The largest artery in the body  
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apex of the heart   The lower tip of the heart  
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arteriole   A small artery  
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artery   The largest type of blood vessel; carries blood away from the heart to all parts of the body  
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atrioventricular bundle ( bundle of His)   Specialized muscle fibers connecting the atria with the ventricles and transmitting electrical impulses between them  
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atrioventricular node (AV node)   Specialized tissue in the wall between atria; electrical impulses pass from pacemaker through AV node and bundle of His toward ventricles  
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atrium (plural: atria)   One of two upper chambers of the heart  
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capillary   The smallest blood vessel  
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carbon dioxide (CO2)   Waste gas released by body cells, transported via veins to the heart, and then to lungs for exhalation  
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coronary arteries   Blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle  
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deoxygenated blood   Oxygen-poor blood  
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diastole   Relaxation phase of the heartbeat  
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electrocardiogram   Record of the electricity flowing through the heart  
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endothelium   Innermost lining of blood vessels  
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mitral valve   Valve between the left atrium and left ventricle; bicuspid valve  
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murmur   Abnormal swishing sound caused by improper closure of hear valves  
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myocardium   Muscular, middle layer of the heart  
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normal sinus rhythm   Heart rhythm origination in sinoatrial node with resting rate of 60-100 beats/min  
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oxygen   Gas carried by the blood from the lungs to the heart to be pumped via arteries to all body cells  
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pacemaker (sinoatrial node)   Specialized nervous tissue in the right atrium that begins the heartbeat  
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pericardium   Double-layered membrane surrounding the heart  
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pulmonary artery   Artery carrying oxygen-poor blood from the heart to the lungs  
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pulmonary vein   Carries oxygenated blood from the lungs to the left atrium of the heart  
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pulse   The beat of the heart as felt through the walls of the arteries  
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septum (plural: septa)   A partition or wall dividing a cavity, such as that between the right and left aria and right and left ventricles  
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sinoatrial node (SA node)   The pacemaker of the heart  
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sphygmomanometer   An instrument to measure blood pressure  
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systemic circulation   Flow of blood from body tissue to the heart and back  
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systole   The contraction phase of the heartbeat  
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tricuspid valve   Located between the right atrium and right ventricle; has three leaflets or cusps  
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valve   A structure in veins or in the heart that temporarily closes an opening so blood flows in only one direction  
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vein   a thin-walled vessel that carries blood from body tissues and lungs back to the heart; contains valves to prevent the backflow of blood  
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vena cava (plural: venae cavae)   The largest vein in the body; superior and inferior venae cavae return blood to the right atrium of heart  
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venule   A small vein  
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