[单项选择]输尿管梗阻，在肾动态显像中的表现为（）
A. 肾盂不显影
B. 肾盂影无扩大
C. 肾盂影消退快
D. 肾实质不显影
E. 肾盂影明显增浓

Regulative patterns: 6 points
(1) nervous regulation [2`];  (2) humoral regulation [2`];  (3) autoregulation; [2`].
Each characteristic: 9 points
(1) nervous regulation is rapid, temporal, accurate, sensitive, dominant and most important pattern, and it always depends on reflex activities to display function [4`].
(2) humoral regulation is slow, persistent, extensive, torpent, subordinate and secondary important pattern, and it always counts on biological active material, e.g., hormone or enzyme release to show effect [3`].
(3) autoregulation is independent of nervous and humoral factors, and its impact is small, local and limited but useful. [2`].