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15 Cards in this Set
- Front
- Back
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Intercalated Discs |
End to end attachment sites between adjacent cardiac muscle cells. They securely fasten cells together and transmit impulses from cell to cell which allow large groups of cardiac cells to fxn as a single unit |
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Autorhythmic |
The heart is autorhythmic-it does not require nervous system input for contraction |
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Skeleton of the Heart |
-Made of dense fibrous connective tissue rings, located between atria and ventricles to seperate chambers, anchors the valves, attachment for myocardium, ossified in cows. |
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Systole |
Active Contraction |
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Diastole |
Relaxation/Repolarization |
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Cardiac Cycle |
One cycle of atrial and ventricular contraction and relaxation |
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Cardiac Output |
Volume of blood ejected from the left ventricle in one minute -CO=SV x HR (ml/min)=(ml/beat) x (beats/min) |
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Preload |
Volume of blood recieved from atrium |
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Afterload |
Physical resistance by artery |
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Depolarization of cardiac cell |
Sodium and calcium enter cardiac cell from outside cell, potassium leaves cardiac cell |
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Repolarization of Cardiac cell |
Sodium and calcium leave cardiac cell, potassium enters cardiac cell |
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Blood Circulation in Fetus |
Fetus receives oxygenated blood from mother via placenta and umbilical vein. No gas exchange in lungs-only need oxygen to develop, bypassed via circulation. First breath after birth- lung inflation triggers closure of foramen ovale and ductus arteriosus to shut down lung bypass. |
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Ventricular Septal Defect |
Blood from left (oxygenated) and right (unoxygenated) ventricles mix. |
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Patent Ductus Arteriosus |
Mixing blood from the aorta (oxygenated) in pulmonary artery (deoxygenated). |
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Tetralogy of Fallot |
Partial obstruction of right ventriuclar outflow to lungs and pulmonary valve. Thickened right ventricle and increased outflow in aorta. |
