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 summation of the preload and the afterload
查看答案
In the absolute refractory period, the excitability of tissues is()
A. zero
B. infinity
C. greater than the normal
D. less than the normal
E. equal to the normal
The types of humoral regulation often include as following((_)):()
A. paracrine
B. telecrine
C. autocrine
D. neurocrine
E. exocrine
Renal blood flow remains constant induced by ____.()
A. Negative feedback
B. Positive feedback
C. Humoral regulation
D. Nervous regulation
E. Auto-regulation
The((__phase)) of AP of a neuron is formed by()
A. deactivation of Na+ channel
B. Na+ influx
C. K+ efflux
D. Ca2+ influx
E. Cl- influx
微信支付 
支付宝支付