问题
选择题
血液循环的动力器官是（ ）
A．心脏
B．血管壁
C．血管周围肌肉
D．神经
答案
人体内的血液循环，体循环和肺循环都是从心脏的心室开始，历经一些血管到心脏的心房结束的．所以，血管是血液循环的管道，而心脏是血液循环的动力器官．
故选：A
搜题请搜索小程序“爱下问搜题”
血液循环的动力器官是（ ）
A．心脏
B．血管壁
C．血管周围肌肉
D．神经
人体内的血液循环，体循环和肺循环都是从心脏的心室开始，历经一些血管到心脏的心房结束的．所以，血管是血液循环的管道，而心脏是血液循环的动力器官．
故选：A
| 完形填空。 | |||
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