The pulse pressure is a measure of ()
A. the number of heartbeat per minute
B. the sum of the diastolic and systolic pressures
C. the difference between the systolic and diastolic pressures
D. the difference between the arterial and venous pressures
E. the sum of the arterial and venous pressures
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Rapid depolarization (phase 0) of the action potential of ventricular muscle results from opening of ()
A. voltage-gated Ca2+ channels
B. voltage-gated Na+ channels
C. acetylcholine-activated K+ channels
D. inward rectifying K+ channels
E. ATP-sensitive K+ channels
What is most responsible for phase 0 of a cardiac nodal cell? ()
A. Voltage-gated Na+ channels
B. Acetylcholine-activated K+ channels
C. Inward rectifying K+ channels
D. Voltage-gated Ca2+ channels
E. Pacemaker channels
Atrial repolarization normally occurs during the ()
A. P wave
B. QRS complex
C. ST segment
D. T wave
E. isoelectric period
The pressure measured in either the arterial or the venous circulation when the heart has stopped long enough to allow the pressures to equalize is called the ()
A. hemodynamic pressure
B. mean arterial pressure
C. transmural pressure
D. mean circulatory filling pressure
E. hydrostatic pressure
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