When a constant intensity of stimulus persists, AP frequencies of afferent nerve decreased with the time, known as ()
A. fatigue;
B. inhibition
C. adaptation
D. block
E. attenuated propagation
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Regulating capacity of eye is mainly determined by the ()
A. corneal elasticity
B. lens elasticity
C. vitreous elasticity
D. pupil diameter
E. refraction index of aqueous humor
The reason that the myocardial cell does not produce the complete tetanus is___. ()
A. that it is controlled autorhythmicity
B. that its effective refractory period is very long
C. due to its "all or none" contraction
D. due to its atrioventricular delay
E. due to its little reserve of calcium in its sarcoplasmic reticulum
The aorta play an important role in maintaining the diastolic pressure because ___. ()
A. its diameter is large
B. the aortic wall is thick
C. its wall has elasticity and distensibility
D. aortic blood flow is rapid
E. its frictional resistance to the blood flow is small
The diastolic pressure reflects mainly ___. ()
A. stroke volume
B. heart rate
C. peripheral resistance
D. elasticity of aorta
E. blood volume
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