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| Sac surrounding the heart, part of the heart wall |
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| Outermost layer of the heart tissue |
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| Second layer of the heart wall |
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| Inner layer of the heart wall |
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| Upper part of the right chamber of the heart |
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| Lower part of the right chamber of the heart |
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| Upper part of the left chamber of the heart |
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| Lower part of the left chamber of the heart |
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| Partition between the two chambers of the heart |
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| Vessels that carry blood away from the heart |
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| Vessels that carry blood toward the heart |
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| Space within the arteries through which blood flows |
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| Two valves between the atria and ventricles |
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| Atrioventricular valve on the right side of the heart |
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| Largest artery of the body; artery through which blood exits the heart |
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| Valve between the aorta and the left ventricle |
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| A tiny artery connecting to a capillary |
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| a thick-walled blood vessel that, in systemic circulation, carries oxygenated blood away from the heart |
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| Artrioventricular (AV) node |
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| Specialized part of the interatrial septum that sends a charge to the bundle of His |
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| One of two valves that control blood flow between the atria and ventricles |
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| either of the two upper chambers of the heart |
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| Atrioventrivular valve on the left side of the heart |
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| Essential fluid made up of plasma and other elements that circulates throughout the body; delivers nutrients to and removes waste from the body's cells |
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| Measure of the force of blood surging against the walls of the arteries |
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| Any of the tubular passageways in the cardiovascular system through which blood travels |
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| A tiny blood vessel that forms the exchange point between the arterial and venous vessels |
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| CO2 - Waste material transported in the venous blood |
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| Repeated contraction and relaxation of the heart as it circulates blood within itself and pumps it out to the rest of the body or the lungs |
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| Relating to or affecting the heart and blood vessels |
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| Artery that transports oxygenated blood to the head and neck |
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| part of the heart containing specialized tissue that sends charges through heart fibers, causing the heart to contract and relax at regular intervals |
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| Blood vessel that supplies oxygen-rich blood to the heart |
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| Contracting state of the myocardial tissue in the heart's conduction system |
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| Relaxtion phase of a heartbeat |
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| Structure in the fetal circulatory system through which blood flows to bypass the fetus's nonfunctioning lungs |
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| Structure in the fetal circulatory system through which blood flows to bypass the fetal liver |
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| An artery that supplies blood to the thigh |
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| Opening in the septum of the fetal heart taht closes at birth |
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| Muscular organ that receives blood from the veins and ssends it into the arteries |
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| Large vein that draws blood from the lower part of the body to the right atrium |
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| Resting state of the myocardial tissue in the conduction system of the heart |
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| An artery that supplies blood to the cells of the area behind the knee |
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| One of the two arteries that carry blood that is low in oxygen from the heart to the lungs |
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| Valve that controls the blood flow between the right ventricle and the pulmonary arteries |
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| One of four veins that bring oxygenated blood from the lungs to the left atrium |
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| Rhythmic expansion and contraction of a blood vessel, usually and artery |
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| Recharging state; transition from contraction to resting that occurs in the conduction system of the heart |
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| Any of a group of veins that transport deoxygenated blood from the legs |
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| One of the two valves that prevent the backflow of blood flowing out of the heart into the aorta and the pulmonary artery |
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| Region of the right atrium containing specialized tissue that sends electrical impulses to the heart muscle, causing it to contract |
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| Large vein that transports blood collected from the upper part of the body to the heart |
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| Contraction phase of the heartbeat |
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| Any of various structures that slow or prevent fluid from flowing backward or forward |
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| Any of various blood vessels carrying deoxygenated blood toward the heart, except the pulmonary vein |
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| A tiny vein connecting to a capillary |
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