1. The contraction phase of any heart chamber is called _______________, and the relaxation phase is called _______________.

2. The circulatory route from aorta to venae cavae is called the _______________ circuit.

3. The circumflex artery travels in a groove called the _______________.

4. The pacemaker potential of autorhythmic cells is due to the slow influx of _______________.

5. Electrical signals spread quickly from one cardiac myocyte to another through _______________ in the intercalated discs.

6. Repolarization of the ventricles produces the _______________ of the electrocardiogram.

7. Closing of the _______________ valves produces turbulence in the bloodstream, which contributes to the second heart sound.

8. The procedure for listening to the heart sounds is called cardiac _______________.

9. The end-diastolic volume of blood stretches the ventricles and creates myocardial tension called the _______________.

10. The Frank-Starling law of the heart explains why the _______________ of the left ventricle is the same as that of the right.

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