Term
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Definition
| the largest artery. it receives blood from the left ventricle and branches to all parts of the body (root: aort/o) |
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Definition
| the valve at teh entrance to the aorta |
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Term
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Definition
| the point of a cone-shaped structure (adjective: apical). the apex of the heart is formed by the left ventricle and is pointed toward the inferior and left |
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Definition
| a vessel that carries blood from the arteries into the capillaries (root: arteriol/o) |
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Term
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Definition
| a vessel that carries blood away from the heart. all except the pulmonary and umbilical arteries carry oxygenated blood (roots: ater, arteri/o) |
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Term
| atrioventricular (AV) node |
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Definition
| a small mass in the lower septum of the right atrium that passes impulses from the sinoatrial (SA) node toward the ventricles |
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Term
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Definition
| a band of fibers that transmits impulses from the atrioventricular (AV) node to the top of the interventricular septum. in divides into the right and left bundle branches, which descend along the two sides of the septum; the bundle of His |
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Term
| atrioventricular (AV) valve |
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Definition
| a valve between the atrium and ventricle on the right and left sides of the heart. the right AV valve is the tricuspid valve; the left is the mitral valve |
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Term
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Definition
| an entrance chamber, one of the two upper receiving chambers of the heart (root: atri/o) |
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Term
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Definition
| the force exerted by blood against the wall of a vessel |
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Term
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Definition
| branches on the AV bundle that divide to the right and left sides of the interventricular septum |
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Term
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Definition
| a microscopic blood vessel through which materials are exchanged between the blood and the tissues |
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Term
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Definition
| the part of the circulatory system that consists of the heart and the blood vessels |
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Term
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Definition
| a change in electrical charge from the resting state in nerves or muscles |
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Term
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Definition
| the relaxation phase of the heartbeat cycle; adjective: diastolic |
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Term
| electrocardiography (ECG) |
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Definition
| study of the electrical activity of the heart as detected by electronodes (leads) placed on the surface of the body. also abbreciated EKG from the German electrokardiography |
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Term
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Definition
| the thin membrane that lines the chambers of the hear and covers the valves |
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Term
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Definition
| the thin outermost layer of the heart wall |
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Term
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Definition
| any sound produced as the hear functions normally |
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Term
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Definition
| the muscular organ with four chambers that contracts rhythmically to propel blood through vessels to all parts of the body (root: cardi/o) |
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Term
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Definition
| the number of times the heat contracts per minute; recorded as beats per minute (bpm) |
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Term
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Definition
| sounds produced as the heart functions. the two loudest sounds are produced by alternate closing of the valves and are designated S1 and S2 |
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Term
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Definition
| the large inferior vein that brings blood back to the right atrium of the heart from the lower body |
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Term
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Definition
| the valve between the left atrium and the left ventricle; the mitral valve or bicuspid valve |
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Term
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Definition
| the valve between the left atrium and the left ventricle; the left AV valve or bicuspid valve |
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Term
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Definition
| the thick middle layer of the heart wall composed of cardiac muscle |
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Term
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Definition
| the fibrous sac that surrounds the heart |
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Definition
| the vessel that carries blood from the right side of the heart to the lungs to be oxygenated and then back to the left side of the heart |
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Term
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Definition
| the system of vessels that carries blood from the right side of the heart to the lungs to be oxygenated and then back to the left side of the heart |
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Term
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Definition
| the vessels that carry blood from the lungs to the left side of the heart |
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Term
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Definition
| the valve at the entrance to the pulmonary artery |
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Term
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Definition
| the wave of increased pressure produced in the vessels each time the ventricles contract |
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Term
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Definition
| the terminal fibers of the cardiac conducting system. they carry impulses through the walls of the ventricles |
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Term
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Definition
| a return of electrical charge to the resting state in nerves or muscles |
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Term
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Definition
| the valve between the right atrium and right ventricle; the tricuspid valve |
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Term
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Definition
| a wall dividing two cavities such as two chambers of the heart |
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Definition
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Term
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Definition
| a small mass in the upper part of the right atrium that initiates the impulse for each heartbeat; the pacemaker |
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Term
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Definition
| an instrument for determining arterial blood pressure (root sphygm/o means "pulse"); blood pressure apparatus or cuff |
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Term
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Definition
| the large superior vein that brings deoxygenated blood back to the right atrium from the upper body |
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Term
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Definition
| the system of vessels that carries oxygenated blood form the left side of the heart to all tissues except the lungs and returns deoxygenated blood to the right side of the heart |
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Term
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Definition
| the contraction phase of the heartbeat cycle; adjective: systolic |
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Term
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Definition
| a structure that keeps fluid flowing in a forward direction (roots: vavl/o, valvul/o) |
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Term
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Definition
| a vessel that carries blood from the capillaries to the veins |
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Term
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Definition
| a tube or duct to transport fluid (roots: angi/o, vas/o, vascul/o) |
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