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34 Cards in this Set
- Front
- Back
The heart is enclosed within an area of the thorax known as
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Mediastinum
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The double sac membrane that cover the heart is the
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Pericardium
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The heart has three layers of tissue; the middle and thickest layer is called
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Myocardium
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The layer of the heart tissue lining the heart chambers and covering valve tissue is the
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endocardium
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The heart chambers are seperated longitudinally by a body of tissue known as the
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cardiac septum
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The blood recieving chamber of the heart are the
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atria
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The flat, wrinkled appendage of the atruim, which increases its capacity is the
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auricle
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The vena cava enter the right atrium along with a third vein known as
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Coronary Sinus
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The pumping chamber of the heart are the
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ventricles
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Blood returns to the heart from the lungs by means of the
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Pulmonary Veins
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The large artery carrying blood to the body from the left ventricle of the heart is the
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aorta
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Those blood vessels that carry blood away from the heart are
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arteries
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Those blood vessels that carry blood toward the heart are
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veins
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On the right side of the heart, the valve between the right atrium and right ventricle
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tricuspid valve
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On the left side of the heart, the bicuspid valve has two flaps and is also known as the
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mitrial valve
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The valves leading toward the pulmonary trunk and aorta are referred to as the
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semilunar valves
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Arteries suppling blood to the tissue of the heart are the
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coronary arteries
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Cardiac muscle cells are connected to one another by junctions called
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intercalculated discs
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The 1st heart sound of the heart means the
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closure of AV valves (shuts)--and ventricular contraction (systole)
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The 2nd sound of the heart means
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The closing of the Semilunar Valves and relaxation (diastole)
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This device records the electreical activities associated with the contraction and relaxation of the heart, measured by placement of electrodes on the body surface
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Electrocardiogram (EKG)
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Atrial Depolarization; signals atrial systole
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P wave (EKG)
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Ventricular depolarization ; signals onset of the ventricular systole
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QRS wave (EKG)
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Ventricular repolarization ; precedes ventricular diastole
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T wave (EKG)
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Heart contractions are known by the alternate term
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systole
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relaxation periods of the heart when contractions are not occuring is
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diastole
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The smallest vessels, which carry bood toward to the cells of the tissues are the
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capillaries
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The semilunar valves prevent blood from flowing backwards into
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The ventricles
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Most of the cardic muscles of the heart is found in
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myocardium
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cardic muscle has specialized cells known as
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nodal cells
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transmits action potentials to the top of interventricular septum
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bundle fo HIS
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conducts action potential to ventricular muscle cells ; stimulates contraction of cardiac muscle cells as a unit
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Purkinje Fibers; AKA bundle of HIS
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supplied by VAGUS nerve;
releases ACETYCHOLINE Inhibitory effect on the heart; decreases heart rate decreases force of contraction |
Parasympathetic stimulation
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Supplied by cardic nerves;
Releases Norepinephrine stimulatory effect on heart; increases heart rate; increases force of contraction |
Sympathetic division
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