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【多选题】
How can extracellular signals regulate the permeability of gap junctions?
A.
Gap junctions in many tissues can be opened or closed in response to extracellular or intracellular signals.
B.
The neurotransmitter dopamine, for example, reduces gap-junction communication between certain neurons in the mammalian retina when secreted in response to an increase in light intensity.
C.
This reduction in gap-junction permeability alters the pattern of electrical signaling and helps the retina switch from using rod photoreceptors, which are good detectors of low light levels, to cone photoreceptors, which detect color and fine detail in bright light.
D.
Gap junctions are dynamic structures that, like conventional ion channels, are gated: they can close by a reversible conformational change in response to extracellular or intracellular sign als . The permeability of gap junctions decreases within seconds, for example, when the intracellular Ca 2+ concentration is raised.
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举一反三
【判断题】规模经济是指一定时期内产品的单位成本随着总成本的增加而降低,它可以表现在企业的每一个职能环节中。
A.
正确
B.
错误
【单选题】The characteristic of key enzyme regulation is
A.
Reversible reactions catalyzed by key enzymes
B.
enzyme regulation does not affect the metabolic rate of the whole system
C.
Its catalytic activity was higher in the enzyme system
D.
Enzymes that catalyze the intermediate pathways of metabolic reactions
E.
Can be regulated by substrates and a variety of metabolites
【单选题】测试导入单选题38某截瘫患者,入院时骶尾部压疮,面积2.5cm×2cm,深达肌层,表面有脓性分泌物,创面周围有黑色坏死组织,护理措施是
A.
选择1用50%乙醇按摩创面及周围皮肤
B.
选择2用生理盐水清洗并敷新鲜鸡蛋膜
C.
选择3暴露创面,红外线每日照射1次
D.
选择4剪去坏死组织,用过氧化氢溶液洗净,置引流纱条
E.
选择5涂厚层滑石粉包扎
【单选题】麦芽可生用、炒用或炒焦用其中炒麦芽偏于(),用于食积不消,妇女断乳
A.
健脾开胃、疏肝行气
B.
消食除胀、降气化痰
C.
消食化滞
D.
行气消食、回乳消胀
E.
消食化积、行气化瘀
【单选题】2两根杆材料的弹性模量为E,横截面面积为A,受力如图所示。若使节点名C没有竖直方向的位移,则集中力P1和P2应满足的条件是( )。
A.
P1=0
B.
P1=P2
C.
P1=0.75P2
【单选题】某截瘫患者,入院时尾骶部褥疮,面积5×2cm,深达肌层,表面有脓性分泌物,创面周围有黑色坏死组织,护理措施是( )
A.
用50%乙醇按摩创面及周围皮肤
B.
用生理盐水清洗并敷新鲜鸡蛋膜
C.
暴露创面,红外线每日照射1次
D.
剪去坏死组织,用过氧化氢溶液洗净,置引流纱条
E.
涂厚曾滑石粉包扎
【单选题】Which enzyme is the key enzyme in glycogenolysis (glycogen degradation) ?
A.
Phosphorylase
B.
Hexokinase
C.
Phosphoenol pyruvate carboxykinase
D.
HMG-CoA reductase
E.
Pyruvate kinase
【判断题】麦芽可用于妇女断乳。
A.
正确
B.
错误
【单选题】药品经营与管理专业就业方向分布最高的是()
A.
制药/生物工程
B.
医疗/护理/卫生
C.
医疗设备/器械
D.
批发/零售
【单选题】2两根杆材料的弹性模量为E,横截面面积为A,受力如图所示。若使节点C没有竖直方向的位移,则集中力P1和P2应满足的条件是()。
A.
P1=0
B.
P1=P2
C.
P1=0.75P2
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