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
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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
Whether skeletal muscle can produce the tetanus or not is determined by ___. ()
A. the types of stimulation
B. intensity-time ratio
C. stimulation frequency
D. stimulating time
E. stimulation intensity
The terminal cisternae of sarcoplasmic reticulum in skeletal muscle can store ___. ()
A. Na+
B. K+
C. H+
D. Cl-
E. Ca2+
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