Which are right in the following descriptions about the sodium pump? ()
A. it is also called as the sodium-potassium pump
B. it can remove K+ out the cell and take Na+ into the cell
C. it can transport Na+ and K+ at the same time
D. it is an ATPase
E. it is a special membrane protein.
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The factors enhancing contractility of muscle are ()
A. Ca2+
B. caffeine
C. adrenaline
D. hypoxia
E. acidosis
The mechanisms of AP are ()
A. Na+ influx in depolarization phase
B. K+ efflux in repolarization phase
Ca2+ influx in depolarization phase
D. Ca2+ efflux in repolarization phase
E. Na+ - K+ pump after repolarization
The functions of the microcirculation are ()
A. the exchange of nutrients and wastes between blood and tissue
B. the filtration of water through capillaries
C. the regulation of vascular resistance
D. the autoregulation of blood flow
E. its role as a blood reservoir
Physiological characteristics of ventricular muscle cells are ()
A. rich in myofibrils
B. poor in myofibrils
C. to generate the AP automatically
D. to conduct AP
E. contractile cells
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