Muscles are stringy bundles of fibers varying from one five-thousandth of an inch to about three inches. They have three unique characteristics: they can become shorter and thicker and can stretch to their original position. Under a high-powered microscope, muscle tissue is seen as long, slender cells with a grainy texture like wood.
More than half of a person's body is composed of muscle fibers, most of which involuntary --in other words, work without conscious direction. The voluntary muscles, those that we move consciously to perform. particular action, number more than five hundred. Women have only 60 to 70 percent as muscle as men for their body mass. That is why an average woman can't lift as much, throw as far, or hit as hard as an average man.
Intelligent use of the muscles means that ______.
A.one always knows what his muscles are doing
B.one performs simple actions without working
C.one's muscles are used only to the extent necessary for each action they perform
D.one improves muscular action consciously
第1题
患者,男性,22岁。在打篮球时突发右侧胸部剧痛,憋气、干咳,到医院就诊。经体格检查,血压135/80mmHg,心率116次/分,听诊右侧呼吸音弱,X线显示右侧肺野外带无肺纹理,肺压缩50% 其诊断应为
第5题
患者近日出现干咳,轻微活动后气短,胸部 X线片检查未见异常。该做下列哪项检查了解可能病变情况
A.心电图
B.心脏多普勒超声
C.肺功能检测
D.PPD皮试
E.心肌酶测定
第6题
患者近日出现干咳,轻微活动后气短,胸部 X线片检查未见异常。该做下列哪项检查了解可能病变情况
A.心电图
B.心脏多普勒超声
C.肺功能检测
D.PPD皮试
E.心肌酶测定
第7题
患者近日出现干咳,轻微活动后气短,胸部 X线片检查未见异常。宜做下列哪项检查了解可能病变情况
A.心电图
B.心脏多普勒超声
C.肺功能检测
D.PPD皮试
E.心肌酶测定
第8题
患者男,43岁。突发寒战高热,黄疸,右上腹剧痛。患者的诊断为
A.急性胰腺炎
B.肝脓肿
C.胆道蛔虫
D.胰头癌
E.急性化脓性胆管炎
第9题
患者,男,58岁。突发意识障碍,能唤醒,醒后可简单回答问题及勉强配合检查,停止刺激后又立即入睡。
这种意识状态是
A.嗜睡
B.昏睡
C.昏迷
D.谵妄
E.意识模糊
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