下列哪一项舒张期正向血流速度最大A.颈内动脉B.颈外动脉C.颈总动脉D.锁骨下动脉E.颈静脉

作者: rantiku 人气: - 评论: 0
问题 下列哪一项舒张期正向血流速度最大
选项 A.颈内动脉 B.颈外动脉 C.颈总动脉 D.锁骨下动脉 E.颈静脉
答案 A
解析 :颈内动脉循环阻力小,收缩期加速时间短,频谱陡直上升。而舒张期减速时间较长。频谱下降缓慢,故为低阻力频谱。

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