Atrial repolarization normally occurs during the ()
A. P wave
B. QRS complex
C. ST segment
D. T wave
E. isoelectric period
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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
Resistance of blood flow through a tube is proportional to the ()
A. square of the radius
B. square root of the length
C. fourth power of the radius
D. square of the length
E. square root of the radius
The basal functional unit of muscle contraction is ()
A. Myofibril
B. Sarcomere
C. muscle fiber
D. thick filament
E. thin filament
The initial length of skeletal muscle is determined by ___. ()
A. passive tension
B. preload
C. afterload
D. the difference between the preload and the afterload
E. the sum of the preload and the afterload
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