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15 Cards in this Set

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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
Anterior interventricular sulcus
a sulcus located on the anterior surface of the heart that separates the left and the right ventricles
Coronary sulcus
Coronary sulcus a large sulcus that runs obliquely around the heart, separating the atria from the ventricles
Depolarization phase
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
Desmosomes
Desmosomes specialized plasma membrane structures in the intercalated discs that hold adjacent cells together
Early repolarization phase
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
End-diastolic volume
End-diastolic volume the volume of blood in the ventricles following ventricular diastole;
normally 120-130mL of blood
End-systolic volume
End-systolic volume the volume of blood in the venticles following ventricular systole;
normally 50-60mL of blood
Epicardium
Epicardium a thin serous membrane that constitutes the smooth outer surface of the heart;
synonymous with the visceral pericardium
Foramen ovale
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
Fossa ovalis
Fossa ovalis a slight oval depression found in the interatrial septum, marks the former location of the foramen ovale
Final repolarization phase a
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
Name the four functions of the heart.
Name the four functions of the heart. 1) generating blood pressure
2) routing blood
3) ensuring one-way blood flow
4) regulating blood supply
P wave
P wave the first peak on an EKG;
the result of action potentials that cause depolarization of the atrial myocardium
Pericardium
a double-layered closed sac that surrounds the heart