Term
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Definition
| the forces that impede the flow of blood out of the heart |
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Term
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Definition
| Heart valve that prevents backflow from the aorta to the left ventricle |
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Term
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Definition
| Pointed end of the heart, the loaction of the point of maximum impulse |
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Term
| Atrioventricular (AV) node |
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Definition
| Group of pacemaker cells in the interatrial septum that relays impulses from the atria to the ventricles |
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Term
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Definition
| The upper chamber of each half of the heart |
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Term
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Definition
| The unique ability of the cardiac muscle to contract without nervous stimulation |
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Term
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Definition
| Pressure sensors in the aorta and carotid arteries that detect changes in blood pressure; also called pressoreceptors |
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Term
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Definition
| Broadest part of the heart; where great vessels enter and leave |
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Term
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Definition
| The series of events that occur from the beginning of one heartbeat to the beginning of the next |
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Term
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Definition
| The amount of blood pumped by the heart in 1 minute |
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Term
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Definition
| Sensors in the aortic arch, carotid arteries, and medulla that detect increased levels of carbon dioxide, decreased levels of oxygen, and decreases in pH |
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Term
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Definition
| Tendinous cords that connect the edges of the AV valves to the papillary muscles to prevent inversion of the valve during ventricular systole |
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Term
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Definition
| Vessels that deliver oxygenated blood to the myocardium |
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Term
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Definition
| Large transverse vein on the heart's posterior that returns blood to the right atrium |
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Term
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Definition
| The period of cardiac muscle relaxation |
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Term
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Definition
| Record of the electrical currents in the heart |
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Term
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Definition
| The endothelial membrane that lines the chambers of the heart |
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Term
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Definition
| The serous membrane on the surface of the myocardium |
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Term
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Definition
| Space between the lungs and beneath the sternum |
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Term
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Definition
| The valve that regulates blood flow between the left atria and left ventricle |
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Term
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Definition
| The middle layer of the heart wall; composed of cardiac muscle |
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Term
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Definition
| Space between the visceral and parietal layers of the serous pericardium that contains a small amount of serous fluid |
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Term
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Definition
| The membranous fibroserous sac enclosing the heart and the bases of the great vessels |
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Term
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Definition
| The amount of tension, or stretch, in the ventricular muscle just before it contracts |
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Term
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Definition
| Sensors in muscles and joints that signal the cardiac center of changes in physical activity |
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Term
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Definition
| Heart valve that prevents backflow from the aorta to the left ventricle |
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Term
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Definition
| Cardiac muscle cell that extends from the bundle branches to the ventricular myocardium; forms the last part of the cardiac conduction system |
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Term
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Definition
| Term applied to the heart's ability to beat regularly |
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Term
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Definition
| The two valves that regulate blood flow between the ventricles and the great arteries |
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Term
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Definition
| The heart's primary pacemaker, where normal cardiac impulses arise |
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Term
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Definition
| The amount of blood ejected by the heart with each beat |
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Term
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Definition
| Contraction of the chambers of the heart |
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Term
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Definition
| The right atrioventricular valve, which regulates flow between the right atria and right ventricle |
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Term
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Definition
| The two lower chambers of the heart |
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