题目内容
(请给出正确答案)
[单选题]
骨骼肌纤维收缩时,肌节的形态变化是()。
A.I带、A带和H带变窄
B.I带变窄,A带不变,H带变窄或消失
C.I带和A带变窄,H带不变
D.I带不变,A带和H带变窄
答案
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A.I带、A带和H带变窄
B.I带变窄,A带不变,H带变窄或消失
C.I带和A带变窄,H带不变
D.I带不变,A带和H带变窄