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【单选题】
与骨骼肌收缩机制相比,平滑肌收缩( )A.
不需要胞质内Ca2+浓度升高
B.
没有粗、细肌丝的滑行
C.
横桥激活的机制不同
D.
有赖于ca2+与肌钙蛋白的结合
E.
都具有自律性
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举一反三
【单选题】According to the passage, which of the following is characteristic of labeled-line theory of taste perception?
A.
The implication that a simultaneous activation of cells is unnecessary to trigger a taste experience
B.
The suggestion that each particular type of gustatory cell is unassociated with the perception of an individual taste
C.
The acceptance of the notion that large patterns could be responsible for creating taste perceptions
D.
The postulation of a concept that specific neurons do not correspond to specific tastes
E.
The view that different kinds of neurons are undifferentiated on a physiological level
【单选题】关于急性阑尾炎的处理不正确的是
A.
条件允许时可先行非手术治疗
B.
化脓性阑尾炎立即实施急诊手术
C.
行阑尾切除术后，需积极抗感染治疗
D.
小儿及妊娠期的，原则上应急诊手术
E.
慢性包块形成的阑尾炎需急诊手术
【简答题】人体肌肉的作用是什么?
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