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1.75亿学生的选择
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扫二维码下载作业帮
1.75亿学生的选择
为什么有些人蹲久了突然站起来会感到头晕,眼前发黑?请用生理学的知识回答,
街角专用0006B
扫二维码下载作业帮
1.75亿学生的选择
这叫体位性低血压.由于突然站起,心脏泵血压力不足,因为蹲踞姿势心脏泵血压力较低,平卧到直立同理.泵血压力不足导致短暂的脑供血不足,所以头晕、眼前发黑.多见于老年人,因为老年人血管弹性差,收缩力不足.是病理学,不是生理学.
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