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| ventricle (belly or pouch) |
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| upper right or left chamber of the heart |
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| membrane lining the cavities of the heart |
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| membrane forming the outer layer of the heart |
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| partition between the right and left atria |
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| partition between the right and left ventricles |
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| protective sac enclosing the heart composed of two layers with fluid between |
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| layer closest to the heart (visceral=pertaining to organ) |
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| outer layer (parietal = pertaining to wall) |
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| fluid-filled cavity between the pericardial layers |
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| lower right or left chamber of the heart |
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| structures within the heart that open and close with the heartbeat to regulate the one-way flow of blood |
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| heart valve between the left ventricle and the aorta |
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| heart valve between the left atrium and the left ventricle (cuspis = point) |
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| pulmonary semilunar valve |
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| heart valve opening from the right ventricle to the pulmonary artery (luna=moon) |
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| valve between the right atrium and right ventricle |
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| valves located at intervals within the lining of veins, especially in the legs, which constrict with muscle action to move the blood returning to the heart |
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| vessels that carry blood from the heart to the arterioles |
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| large artery that is the main trunk of the arterial system branching from the left ventricle |
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| small vessels that receive blood from the arteries |
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| tiny vessels that join arterioles and venules |
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| small vessels that gather blood from the capillaries into the veins |
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| vessels that carry blood to the heart venules |
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| circulation of blood throughout the body via arteries, arterioles, capillaries, venules, and veins to deliver oxygen and nutrients to body tissues |
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| circulation of blood through the coronary blood vessels to deliver oxygen and nutrients to the heart muscle tissue |
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| circulation of blood from the pulmonary artery through the vessels in the lungs and back to the heart via the pulmonary vein, providing for the exchange of gases |
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| to expand; period during the cardiac cycle when blood enters the relaxed ventricles from the atria |
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| to contract; period during the cardiac cycle when the heart is in contraction and blood is ejected through the aorta and the pulmonary artery |
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| the pacemaker; highly specialized, neruological tissue impeded in the wall of the right atrium; responsible for initiating electrical conduction of the heartbeat, causing the atria to contract and firing conduction of impulses to the AV node |
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| atrioventricular (AV) node |
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| neurological tissue in the center of the heart that receives and amplifies the conduction of impulses from the SA node to the bundle of His |
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| neurological fibers extending from the AV node to the right and left bundle branches that fire the impulse from the AV node to the purkinje fibers |
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| fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract |
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| resting; resting state of a myocardial cell |
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