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15 Cards in this Set
- Front
- Back
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Depolarization phase
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a phase of cardiac muscle cell action potential propogation in which voltage-gated Na+ channels open, voltage-gated K+ close, and voltage-gated Ca++ channels begin to open
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Anterior interventricular sulcus
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a sulcus located on the anterior surface of the heart that separates the left and the right ventricles
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Coronary sulcus
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Coronary sulcus a large sulcus that runs obliquely around the heart, separating the atria from the ventricles
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Depolarization phase
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Depolarization phase a phase of cardiac muscle cell action potential propogation in which voltage-gated Na+ channels open, voltage-gated K+ close, and voltage-gated Ca++ channels begin to open
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Desmosomes
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Desmosomes specialized plasma membrane structures in the intercalated discs that hold adjacent cells together
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Early repolarization phase
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Early repolarization phase a phase of cardiac muscle cell action potential propogation in which voltage-gated Na+ channels close and some voltage-gated K+ channels open, causing early repolarization
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End-diastolic volume
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End-diastolic volume the volume of blood in the ventricles following ventricular diastole;
normally 120-130mL of blood |
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End-systolic volume
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End-systolic volume the volume of blood in the venticles following ventricular systole;
normally 50-60mL of blood |
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Epicardium
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Epicardium a thin serous membrane that constitutes the smooth outer surface of the heart;
synonymous with the visceral pericardium |
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Foramen ovale
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Foramen ovale an opening between the right and left atria in the embryo and fetus;
allows blood to flow from the right to the left atrium in the fetus to bypass the pulmonary circulation |
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Fossa ovalis
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Fossa ovalis a slight oval depression found in the interatrial septum, marks the former location of the foramen ovale
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Final repolarization phase a
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Final repolarization phase a phase of cardiac muscle cell action potential propogation in which voltage-gated Ca++ channels close and many voltage-gated K+ open
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Name the four functions of the heart.
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Name the four functions of the heart. 1) generating blood pressure
2) routing blood 3) ensuring one-way blood flow 4) regulating blood supply |
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P wave
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P wave the first peak on an EKG;
the result of action potentials that cause depolarization of the atrial myocardium |
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Pericardium
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a double-layered closed sac that surrounds the heart
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