题目内容：
关于静脉，下列叙述中哪一项是错误的?
A.接受交感缩血管纤维支配
B.管壁平滑肌在静脉被扩张时发生收缩
C.容纳了全身血量的一半以上
D.回心血量的多少与体位变化关系不大
E.回心血量取决于外周静脉压和中心静脉压之差
参考答案：
选择题：关于静脉,下列叙述中哪一项是错误的?
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