关于人体静脉中的血液叙述正确的是A.都是流向心脏          

关于人体静脉中的血液叙述正确的是

A.都是流向心脏                                                          B.颜色都是暗红色

C.含营养物质比较少                                                 D.含二氧化碳多,氧气少

 

答案

A

解析:静脉是将全身血液送回心脏的一种血管,静脉中流的不一定是静脉血,比如肺静脉中流的就是动脉血。

 

相关题目

函数的部分图像是(    ) A.                   
函数的部分图像是(    ) A.                          B. C.                           D.
Dr. Yuan was born in Beijing in 1930. 61 he graduated from Southwest Agricultur
Dr. Yuan was born in Beijing in 1930. 61 he graduated from Southwest Agricultural College in 1953, he has given his life to 62 ( find ) ways to grow more and more rice. As a young man, he saw the g
. It is reported that two hotels,_____ are being built in my hometown,will o
. It is reported that two hotels,_____ are being built in my hometown,will open next year.  A.they both  B.which both   C.both of them  D. of which both
(4分)根据如图所示的流程图计算,若输入x的值为—1,则
(4分)根据如图所示的流程图计算,若输入x的值为—1,则输出y的值为        若输入x的值为7,则输出y的值为                     
下图为我国某区域某时海平面等压线分布示意图。读图完成
下图为我国某区域某时海平面等压线分布示意图。读图完成下列问题。 (1)此时重庆的风向是_   __;A锋面系统类型为__  __,在其过境时,重庆的气
Congratulations on deciding to visit the Big Apple. Whether you choose to spend
Congratulations on deciding to visit the Big Apple. Whether you choose to spend time in the Metropolitan Museum of Art or an S&M club in the West Village, or both, you’re in for quite an expe
用电压表测某段电路两端电压时,指针反向偏转,产生这种
用电压表测某段电路两端电压时,指针反向偏转,产生这种现象的原因是___________。读出图9电压表的示数为    V,电流表的示数为     A。
1943年,美国总统罗斯福就授意他人在《星期六晚报》上发表
1943年,美国总统罗斯福就授意他人在《星期六晚报》上发表《罗斯福的世界蓝图》一文,提出要建立一个由美国领导的、符合美国利益的世界政治与经

最新题目