Cardiovascular System Vocabulary Terms
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| Aorta: | Largest artery in the body
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| Arteriole: | Small artery
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| Artery: | largest type of blood vessel; carries blood away from the heart to all parts of the body
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| Atrioventricular node: | Specialized tissue in the wall between the atria. Electrical impulses pass from the pacemaker through the AV node.
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| Atrium: | One of two upper chambers of the heart
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| Capillary: | Smallest blood vessel. Materials pass to and from the bloodstream through the thin capillary walls
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| Carbon Dioxide: | Gas released by body cells, transported via veins to the heart and then to the lungs for exhalation
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| Deoxygenated blood: | Blood that is oxygen-poor
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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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| Endocardium: | Inner lining of the heart
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| Endothelium: | Innermost living of blood vessels
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| Mitral Valve: | Valve between the left atrium and the left ventricle
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| Murmur: | Abnormal heart sound caused by improper closure of the heart valves
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| Myocardium: | Muscular, middle layer of the heart
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| Normal Sinus Rhythm: | Heart rhythm originating in the sinoatrial node with a resting rate of 60 to 100 beats per minute
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| Oxygen: | Gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells
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| Pacemaker: | Speacialized 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 Circulation: | Flow of blood from the heart to the lungs and back to the heart
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| Pulmonary Valve: | Valve positioned between the right ventricle and the pulmonary artery
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| Pulmonary Vein: | One of two parts of vessels carrying oxygenated blood from the lungs to the left artrium of the heart
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| Pulse: | Beat of the heart as felt through the walls of the arteries
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| Septum: | Partition or wall dividing a cavity; such as between the right and left atria
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| Sinoatrial Node: | Pacemaker of the heart
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| Sphygmomanometer: | Instrument to measure blood pressure
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| Systemic Circulation: | Flow of blood from body tissue to the heart and then from the heart back to body tissues
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| Systole: | Contraction phase of the heartbeat
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| Tricuspid Valve: | Located between the right atrium and the right ventricle
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| Valve: | Structure in veins or in the heart that temporarily closes and opening so that blood flows in only one direction
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| Vein: | Thin-walled vessel that carries blood from body tissues and lungs back to the heart
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| Vena Cava: | Largest vein in the body
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| Ventricle: | One of two lower chambers of the heart
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| Venule: | Small vein
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